Wildlife Landscape

TREASURE VALLEY WILDLIFE & LANDSCAPE THE FOUNDATIONAL DYNAMIC: THE TREASURE VALLEY EXISTS WHERE MOUNTAINS, RIVERS, DESERT, FARMLAND, AND RAPTOR COUNTRY COLLIDE

The Treasure Valley is often described as a metropolitan area centered around Boise, Meridian, Nampa, and Caldwell, but ecologically it is something much larger. It is a transition zone where the Northern Rocky Mountains gradually descend into the western Snake River Plain, where alpine watersheds become irrigated agricultural valleys, where sagebrush steppe meets expanding suburbs, and where one of North America's most extraordinary raptor landscapes begins only a short drive from downtown Boise. The region's identity is inseparable from its physical landscape. Every neighborhood, farm, river, foothill trail, wildlife corridor, reservoir, and public land parcel exists because of geological events, water systems, volcanic history, and thousands of years of ecological succession. Understanding the Treasure Valley therefore requires understanding not only cities, but rivers, soils, wildlife migration, fire ecology, public lands, and habitat connectivity.

The Treasure Valley today represents one of the fastest-growing metropolitan regions in the western United States, yet it remains surrounded by extensive public lands managed by the federal government, state agencies, irrigation districts, and conservation organizations. Rapid residential development is now occurring directly adjacent to mule deer winter range, raptor nesting habitat, riparian corridors, wetlands, and historic agricultural landscapes. This tension between growth and conservation defines much of the region's modern environmental story.

THE GEOLOGICAL FOUNDATION OF THE TREASURE VALLEY

The landscape visible today is the product of millions of years of volcanic activity, tectonic movement, erosion, and catastrophic flooding. The western Snake River Plain formed through ancient volcanic processes and later became one of the defining geographic regions of southern Idaho. The Boise River watershed originates high within the Sawtooth Mountains before descending through rugged canyons into the Treasure Valley, eventually joining the Snake River near Parma. The watershed encompasses roughly 4,100 square miles containing alpine environments, conifer forests, foothill shrublands, agricultural valleys, and urban development.

The Boise River itself is far more than a recreational amenity. It is the ecological backbone of the Treasure Valley. Historically, the river supported seasonal flooding, cottonwood forests, wetlands, native fish populations, and wildlife movement across southern Idaho. During the twentieth century the river became increasingly engineered through the Bureau of Reclamation's Boise Project, with dams, reservoirs, canals, and diversions constructed to provide irrigation, flood protection, hydroelectric generation, and municipal water supplies. Although heavily managed today, the Boise River continues to function as one of the region's most important ecological corridors, linking mountain habitats with agricultural landscapes and urban greenbelts.

SAGEBRUSH STEPPE — THE HIDDEN ECOSYSTEM OF THE TREASURE VALLEY

Many visitors associate Idaho with dense pine forests, yet the Treasure Valley is naturally dominated by sagebrush steppe. This ecosystem is among the most threatened landscapes in North America and serves as the ecological foundation for much of southwestern Idaho. Native vegetation includes big sagebrush, bitterbrush, rabbitbrush, bunchgrasses, native wildflowers, and scattered juniper communities. These plant communities evolved under semi-arid conditions, periodic wildfire, grazing pressure from native herbivores, and seasonal precipitation cycles.

Sagebrush steppe supports remarkable biodiversity despite appearing simple to casual observers. Ground squirrels, jackrabbits, badgers, coyotes, pronghorn in surrounding regions, mule deer, golden eagles, prairie falcons, ferruginous hawks, burrowing owls, reptiles, pollinating insects, and hundreds of native plant species all depend on this ecosystem. Because the prey base thrives in healthy sagebrush landscapes, the region supports one of the world's greatest concentrations of birds of prey.

The ecological importance of sagebrush extends beyond wildlife. Native vegetation reduces erosion, stabilizes soils, supports watershed function, influences groundwater recharge, and helps regulate wildfire behavior. Modern threats include invasive annual grasses such as cheatgrass, increasing wildfire frequency, habitat fragmentation, subdivision development, and transportation infrastructure.

THE BOISE FOOTHILLS — THE CITY'S ECOLOGICAL FRONTIER

The Boise Foothills form one of the defining landscape features of the Treasure Valley. Rising immediately north and east of the city, the foothills create an abrupt transition between urban neighborhoods and expansive public lands stretching into the Boise National Forest. These foothills support native shrub-steppe vegetation, seasonal streams, wildlife movement corridors, recreational trail systems, and panoramic views that have become central to Boise's regional identity.

The City of Boise has invested heavily in protecting foothill landscapes through its Open Space program. Thousands of acres have been preserved to maintain wildlife habitat, restore native vegetation, reduce wildfire risk, protect watershed health, and provide public recreation opportunities. The city's restoration efforts emphasize conservation of sagebrush habitat because it represents one of North America's most imperiled ecosystems. These lands function not simply as parks but as living ecological infrastructure separating urban development from larger public landscapes.

The foothills also illustrate one of the Treasure Valley's most significant environmental challenges. Residential expansion increasingly reaches into former wildlife habitat, creating conflicts involving mule deer, coyotes, black bears on occasion, mountain lions, nesting raptors, wildfire management, invasive weeds, and recreational pressure.

THE BOISE RIVER CORRIDOR — THE REGION'S LIVING ECOLOGICAL ARTERY

The Boise River corridor forms one of the most biologically productive environments within the Treasure Valley. Cottonwood forests, willow communities, wetlands, side channels, gravel bars, ponds, irrigation returns, and riparian vegetation provide habitat that contrasts sharply with the surrounding sagebrush environment.

Numerous bird species depend on the Boise River during migration and breeding seasons. Waterfowl, shorebirds, songbirds, osprey, bald eagles, herons, kingfishers, beavers, muskrats, amphibians, reptiles, and native fish all utilize portions of the river corridor. The river also serves as an important movement corridor allowing wildlife to navigate between mountain environments, agricultural landscapes, and lower-elevation habitats.

Human use and ecological function coexist continuously along the Boise River. Floating, fishing, cycling, walking, irrigation, drinking water production, flood control, wildlife conservation, and urban recreation all occur simultaneously within the same watershed.

BOISE RIVER WILDLIFE MANAGEMENT AREA — WINTER REFUGE FOR BIG GAME

One of the least appreciated wildlife institutions in southwest Idaho is the Boise River Wildlife Management Area administered by the Idaho Department of Fish and Game. The area protects tens of thousands of acres surrounding Lucky Peak Reservoir and was established primarily to conserve winter habitat for mule deer and elk. Today the management area supports extensive sagebrush communities at lower elevations and ponderosa pine forests higher in the watershed while providing seasonal habitat for thousands of mule deer, hundreds of elk, upland birds, predators, and numerous smaller mammals.

Winter range protection is particularly important because harsh seasonal conditions concentrate wildlife into lower elevations where food availability becomes limited. Development within these landscapes can fragment migration routes and reduce survival during severe winters. Consequently, the Wildlife Management Area represents not simply protected land but long-term investment in maintaining healthy wildlife populations throughout southwestern Idaho.

THE MORLEY NELSON SNAKE RIVER BIRDS OF PREY NATIONAL CONSERVATION AREA

Approximately thirty-five miles south of Boise lies one of the world's most remarkable wildlife landscapes. The Morley Nelson Snake River Birds of Prey National Conservation Area encompasses approximately 485,000 acres surrounding eighty-one miles of the Snake River canyon. Congress established the Conservation Area in 1993 specifically to protect one of the greatest concentrations of nesting birds of prey known anywhere in North America, and perhaps the world. Each spring approximately eight hundred nesting pairs of hawks, falcons, owls, and eagles occupy cliffs rising hundreds of feet above the Snake River.

The extraordinary concentration of raptors exists because geology, vegetation, prey abundance, and climate combine in unusually favorable ways. The canyon walls provide protected nesting sites while the surrounding sagebrush plains support abundant populations of ground squirrels, jackrabbits, and other small mammals that sustain predators throughout the breeding season.

Congress later renamed the Conservation Area in honor of Morley Nelson, whose decades of research, education, photography, and advocacy fundamentally changed public understanding of raptor conservation in Idaho. His work helped transform the Snake River canyon from an overlooked landscape into one of the world's premier bird conservation areas.

THE PEREGRINE FUND AND THE WORLD CENTER FOR BIRDS OF PREY

Boise occupies an internationally significant position within raptor conservation through the presence of the World Center for Birds of Prey. Operated by The Peregrine Fund, the center serves as headquarters for worldwide research, captive breeding, endangered species recovery, scientific archives, education, and international conservation initiatives. Located south of Boise, the facility houses breeding programs, research collections, interpretive exhibits, and one of the world's leading repositories devoted to birds of prey. Morley Nelson played an instrumental role in bringing The Peregrine Fund to Boise, further strengthening the region's global reputation in raptor science and conservation.

The presence of this institution means the Treasure Valley is not merely home to exceptional wildlife; it is also an international center for wildlife science and conservation leadership.

IDAHO FISH AND GAME — THE STATE'S PRIMARY WILDLIFE STEWARD

The Idaho Department of Fish and Game serves as the principal state agency responsible for managing Idaho's wildlife resources. Established by the Idaho Legislature in 1899, the department oversees mammals, birds, fish, reptiles, amphibians, invertebrates, hunting regulations, fisheries, habitat restoration, wildlife research, conservation planning, and public access across the state. Within the Treasure Valley the agency manages Wildlife Management Areas, conducts biological monitoring, restores habitat, works with landowners, regulates hunting seasons, and partners with numerous federal agencies and nonprofit organizations.

Its role extends far beyond licensing hunters and anglers. Modern wildlife management requires balancing ecological integrity, recreation, agriculture, development, disease monitoring, invasive species management, and long-term habitat conservation.

PUBLIC LANDS AS THE REGION'S ECOLOGICAL FRAMEWORK

Unlike many metropolitan areas, the Treasure Valley remains immediately connected to enormous expanses of public land. Bureau of Land Management lands dominate much of the southern landscape while the Boise National Forest begins immediately beyond the foothills. These public lands provide habitat for wildlife, recreational opportunities, watershed protection, grazing, scientific research, cultural resources, and fire management.

This extensive public ownership creates ecological continuity rarely found around rapidly growing metropolitan regions. Large mammals, migratory birds, raptors, reptiles, pollinators, and native plant communities continue to occupy interconnected landscapes extending well beyond city boundaries.

The Bureau of Land Management's stewardship of the Morley Nelson National Conservation Area illustrates how federal land management, wildlife conservation, recreation, livestock grazing, military activities, and scientific research can coexist within carefully managed landscapes. Congress specifically directed that habitat conservation remain the highest priority while allowing compatible uses to continue.

FIRE AS A LANDSCAPE-SHAPING FORCE

Wildfire has always been part of southwestern Idaho's ecological history, but its frequency and intensity have increased significantly due to invasive annual grasses, changing climate conditions, expanding development, and altered fire regimes. Cheatgrass has transformed portions of the sagebrush ecosystem by creating continuous fine fuels that promote larger and more frequent fires.

Large fires can permanently alter habitat quality for sagebrush-dependent wildlife while simultaneously reducing prey availability for raptors. Habitat restoration efforts increasingly focus on reseeding native vegetation, controlling invasive plants, stabilizing soils, and rebuilding ecological resilience following major fire events. The Birds of Prey Conservation Area itself continues to prioritize restoration because healthy sagebrush ecosystems directly support healthy raptor populations.

WILDLIFE AND URBAN GROWTH

The Treasure Valley's population growth increasingly places residential neighborhoods adjacent to functioning wildlife habitat. Mule deer regularly move through subdivisions, coyotes occupy urban open spaces, raptors nest near developed areas, and migratory birds depend upon increasingly fragmented riparian corridors. Transportation corridors introduce vehicle collisions while expanding trail systems increase recreational pressure on sensitive habitats.

This does not represent a temporary condition. It is becoming one of the defining environmental characteristics of the modern Treasure Valley. The future of the region depends upon balancing economic growth with preservation of ecological processes that existed long before modern settlement.

THE TREASURE VALLEY AS A LIVING LANDSCAPE

The Treasure Valley should not be understood simply as a collection of cities separated by farmland. It is an interconnected ecological system where mountains feed rivers, rivers sustain agriculture, agriculture shapes settlement, foothills support wildlife, public lands preserve migration routes, and one of the world's greatest raptor landscapes begins just beyond the urban edge. Wildlife, geology, hydrology, vegetation, and human communities remain deeply intertwined despite rapid metropolitan growth.

WHY THIS MATTERS

The wildlife and landscape story explains why the Treasure Valley looks, functions, and evolves the way it does. Rivers determine settlement, sagebrush supports biodiversity, public lands maintain ecological continuity, and conservation institutions preserve systems that would otherwise be fragmented by growth. Understanding these relationships provides context that isolated descriptions of parks, trails, or individual species cannot.

THE DEEPER DYNAMIC: THE TREASURE VALLEY IS A HABITAT-CONVERSION FRONTIER WHERE PUBLIC LANDS, WINTER RANGE, RIVER CORRIDORS, FIRE, INVASIVE GRASSES, RESTORATION SCIENCE, AND URBAN RECREATION ALL COLLIDE

The deeper wildlife-landscape story of the Treasure Valley is not simply that Boise has foothills, birds, deer, rivers, and public lands. The real story is that the region sits on the edge of several overlapping ecological systems that are now being stressed at the same time: sagebrush steppe fragmentation, mule deer and elk winter range pressure, Boise River riparian degradation and restoration, Snake River canyon raptor protection, invasive annual grass expansion, fire recovery, suburban growth, trail-use intensity, wildlife-vehicle conflict, and long-term watershed management. Idaho Fish and Game’s 2023 State Wildlife Action Plan is the statewide conservation framework for at-risk fish, wildlife, plants, and habitats, and the agency notes that the 2023 revision incorporated plant species for the first time and was approved by the U.S. Fish and Wildlife Service, extending the plan for a decade and preserving about $700,000 annually in federal conservation funding. Source: https://idfg.idaho.gov/swap and https://idfg.idaho.gov/article/us-fish-and-wildlife-service-approves-2023-idaho-state-wildlife-action-plan-risk-species.

This matters because the Treasure Valley is no longer just managing individual animals. It is managing systems. The region’s wildlife future depends on whether agencies, cities, nonprofits, landowners, hunters, recreation users, developers, and water managers can keep habitat connected and functional while the human footprint expands.

IDAHO FISH AND GAME — THE STATE WILDLIFE OPERATING AUTHORITY

Idaho Fish and Game is the central state institution for wildlife management, but its role is much broader than issuing hunting and fishing licenses. The agency manages Wildlife Management Areas, big game herds, fisheries, habitat restoration, conservation planning, species monitoring, public access, hunter regulation, wildlife conflict, and endangered-species prevention. Idaho Fish and Game says Idaho has 31 Wildlife Management Areas ranging from 275 to 85,000 acres, each with priorities based on surrounding wildlife needs. Source: https://idfg.idaho.gov/visit/wma.

For the Treasure Valley, the key point is that Idaho Fish and Game functions as both a biological agency and a land-management agency. Its decisions affect winter range closures, controlled hunts, habitat treatments, invasive weed control, public access, fire rehabilitation, fishing regulations, wildlife crossing priorities, and the way urban residents interact with living landscapes. This is why the agency belongs near the center of the wildlife-landscape vertical rather than being treated as a hunting-office footnote.

THE STATE WILDLIFE ACTION PLAN — THE AT-RISK SPECIES FRAMEWORK

The Idaho State Wildlife Action Plan is the deep planning layer behind much of the state’s conservation work. Idaho Fish and Game describes SWAP as the framework for conserving Species of Greatest Conservation Need and the habitats they depend on, with an integrated approach intended to reduce potential Endangered Species Act listings. Source: https://idfg.idaho.gov/species/taxa/sgcn.

This is important because federal endangered-species listings can reshape land use, water projects, grazing, development, transportation, recreation, and agriculture. A strong state wildlife action plan is a preventative governance tool. It identifies vulnerable species and habitats before crisis-level federal intervention becomes necessary. For Boise Standard, SWAP is a critical source because it ties local wildlife into statewide policy, federal funding, and long-term habitat strategy.

BOISE RIVER WILDLIFE MANAGEMENT AREA — THE WINTER RANGE ENGINE

The Boise River Wildlife Management Area is one of the most important wildlife landscapes in the Treasure Valley. Idaho Fish and Game describes it as a 41,500-acre WMA situated in the foothills of the Boise and Danskin mountains along Lucky Peak and Arrowrock reservoirs. It supports more than 300 wildlife species, including Idaho’s largest wintering mule deer herd. Source: https://idfg.idaho.gov/visit/wma/boise-river.

The deeper reason this area matters is seasonal survival. Idaho Fish and Game states that the WMA is primary winter range for deer and elk in Big Game Unit 39, with an estimated 5,000 to 8,000 mule deer and 1,800 elk wintering there each year. Black bear, mountain lion, pronghorn, chukar, gray partridge, California quail, dusky grouse, ruffed grouse, and mourning doves also occur there. Source: https://idfg.idaho.gov/visit/wma/boise-river.

Winter range is not interchangeable land. Animals can summer across much larger mountain landscapes, but winter compresses them into lower-elevation habitat where snow depths, forage quality, road access, human disturbance, and energy loss determine survival. That is why Boise River WMA is not just “open space.” It is a seasonal life-support system for big game herds that also holds raptors, upland birds, predators, and riparian habitat.

THE VALLEY FIRE AND POST-FIRE HABITAT RECOVERY

The 2024 Valley Fire turned the Boise River WMA into a live case study in how wildfire can damage winter range. Idaho Fish and Game announced winter closures in 2026 for the portion of the WMA west of Highway 21 to benefit wintering big game and support rehabilitation from the 2024 Valley Fire. The agency stated that nearly 10,000 acres burned and that the affected area serves as critical winter range for roughly 2,400 mule deer and 650 elk. Source: https://idfg.idaho.gov/article/fish-and-game-will-restrict-access-boise-river-wma-second-winter.

Golden Eagle Audubon’s Valley Fire restoration material gives the ecological reason the burn matters: the fire scorched almost 10,000 acres within the WMA and destroyed sagebrush, bitterbrush, and riparian vegetation, which are essential for nesting birds, ground nesters, and wintering deer and elk; sagebrush does not resprout after fire and must regenerate from seed, which can take decades. Source: https://www.goldeneagleaudubon.org/restoration/valley-fire-restoration-project.

Fire is not merely an emergency event. In sagebrush country, fire can permanently shift vegetation communities toward cheatgrass, medusahead, rush skeletonweed, and other invasive plants if restoration fails. Idaho Fish and Game’s 2025 post-fire treatment notices specifically mention aerial and ground herbicide treatments targeting rush skeletonweed, cheatgrass, and medusahead rye as part of Boise River WMA rehabilitation. Source: https://idfg.idaho.gov/article/aerial-herbicide-spraying-will-close-portion-boise-river-wma-about-three-days-during-week.

HIGHWAY 21 WILDLIFE CROSSING — MIGRATION INFRASTRUCTURE MADE VISIBLE

State Highway 21 is one of the clearest places where Treasure Valley growth, recreation, roads, and wildlife migration physically intersect. The U.S. Fish and Wildlife Service explains that roughly ten miles east of Boise, Highway 21 cuts across migration routes used by thousands of mule deer and elk, with roughly 8,000 to 9,000 mule deer and 1,800 to 2,400 elk from Boise River herds crossing the highway twice each year during seasonal migration. Source: https://www.fws.gov/story/2024-03/idahos-new-wildlife-overpass-improves-public-safety-and-wildlife-migration.

The Cervidae Peak wildlife overpass is the physical answer to that conflict. The Federal Highway Administration describes the project as construction of a wildlife over-crossing at milepost 19.3, with big-game fencing, access and maintenance gates, wildlife jump-outs, and cameras to document animal use. Source: https://highways.dot.gov/federal-lands/projects/id/dot-21-1.

Idaho Fish and Game reported that more than 1,000 mule deer used the Idaho 21 overpass between October 17 and December 18, 2024, and that the key success was not merely that deer crossed the overpass, but that they did not cross the busy highway. Source: https://idfg.idaho.gov/article/video-watch-thousand-mule-deer-cross-idaho-21-overpass-near-boise.

This matters because wildlife crossings convert ecological knowledge into hard infrastructure. They are transportation projects, public-safety projects, wildlife projects, insurance-risk projects, and migration-corridor preservation projects at the same time. Boise Standard should treat them as part of the landscape infrastructure system, not as feel-good animal stories.

MORLEY NELSON SNAKE RIVER BIRDS OF PREY NCA — THE RAPTOR CAPITAL EDGE

The Morley Nelson Snake River Birds of Prey National Conservation Area remains one of the defining ecological assets of the Treasure Valley region. The Bureau of Land Management describes the NCA as a 485,000-acre area along 81 miles of the Snake River, home to the densest population of nesting birds of prey in North America and perhaps the world, with approximately 800 pairs of hawks, eagles, falcons, and owls nesting in lava cliffs and surrounding desert plateau. Source: https://www.blm.gov/visit/morley-nelson-snake-river-birds-prey-national-conservation-area.

The deeper point is that Morley Nelson is not only a protected place. It is a complete ecological relationship: lava cliffs provide nesting substrate, sagebrush steppe supports prey species, the Snake River canyon shapes microclimate and refuge, and federal land management attempts to preserve the combination. If the prey base collapses through habitat loss, invasive grass conversion, or fire, the nesting cliffs alone are not enough. Raptors require a working desert ecosystem around the canyon.

BLM STEWARDSHIP AND PUBLIC LAND COMPLEXITY

The Bureau of Land Management is one of the most important land stewards in southwest Idaho because it manages much of the public land south of Boise and around the Snake River canyon. In the Morley Nelson NCA, BLM is not simply maintaining scenic land. It is balancing raptor conservation, recreation, grazing, cultural resources, fire, invasive weeds, public access, military-adjacent land uses, research, and restoration. BLM’s official description emphasizes the 485,000-acre conservation area and its unique concentration of nesting raptors. Source: https://www.blm.gov/visit/morley-nelson-snake-river-birds-prey-national-conservation-area-0.

This is why public lands are central to the wildlife-landscape vertical. The Treasure Valley is not a purely private metropolitan landscape. It is a metro embedded in public land systems. That creates ecological continuity, but it also creates conflict between recreation, conservation, grazing, weeds, fire response, and growth pressure.

DEER FLAT NATIONAL WILDLIFE REFUGE — THE WETLAND AND MIGRATION COUNTERWEIGHT

Deer Flat National Wildlife Refuge is the major wetland refuge in the western Treasure Valley. The U.S. Fish and Wildlife Service describes Deer Flat as an urban oasis where nature connects people, communities, and wildlife. Its Lake Lowell Unit protects nesting colonies of western and Clark’s grebes and major migratory and wintering concentrations of mallards and Canada geese, while the Snake River Islands Unit provides nesting habitat for ducks, geese, songbirds, herons, egrets, and other wildlife. Source: https://www.fws.gov/refuge/deer-flat.

Visit Idaho’s refuge profile adds the spatial structure: the Lake Lowell Unit encompasses over 10,500 acres, including almost 9,000-acre Lake Lowell and surrounding lands, while the Snake River Islands Unit includes more than 1,000 acres on 104 islands distributed along 113 river miles from the Canyon-Ada County line to Farewell Bend in Oregon. Source: https://visitidaho.org/things-to-do/wildlife-viewing-birding/deer-flat-national-wildlife-refuge/.

This refuge is essential because it anchors the wetland and waterfowl side of the landscape. The Treasure Valley is often framed as foothills and sagebrush, but Deer Flat shows the other major ecological face: reservoirs, islands, migration, nesting colonies, waterfowl concentrations, riparian edges, and urban wildlife access.

BOISE CITY OPEN SPACE — URBAN CONSERVATION AS A GOVERNMENT FUNCTION

The City of Boise is itself a conservation actor. Boise says it owns more than 5,000 acres of open space reserves located primarily in sagebrush steppe, and it identifies sagebrush steppe as one of the most imperiled ecosystems in North America. The city describes its open space management as science-based and adaptive, founded on protection of intact habitat, preventative management, and restoration or rehabilitation where feasible. Source: https://www.cityofboise.org/departments/parks-and-recreation/open-space/habitat-restoration/.

The open-space program is a major urban institution because Boise voters directly funded conservation. The city says voters approved a $10 million levy in November 2015 to support preservation of open space and habitat and clean water improvement projects in the Boise Foothills, Boise River, and city open-space sites. Source: https://www.cityofboise.org/departments/parks-and-recreation/open-space/.

That is a powerful local governance signal. Boise’s landscape identity is not accidental. Citizens paid to preserve it. This ties wildlife habitat directly to municipal finance, recreation, real estate value, public health, and civic identity.

RIDGE TO RIVERS — RECREATION PRESSURE AND HABITAT MANAGEMENT

Ridge to Rivers is the institutional system that manages much of the Boise Foothills trail experience. BLM describes the trail system as more than 190 miles of trails connecting neighborhoods with public lands and the natural environment. Source: https://www.blm.gov/visit/ridge-rivers-trail-system.

The deeper relevance is not simply recreation. Trail systems can protect habitat by concentrating use, but they can also damage soils, disturb wintering wildlife, spread weeds, and fragment quiet habitat if unmanaged. Ridge to Rivers seasonal closure notices show this balance directly. The Landslide Loop Trail above Hidden Springs closes annually from December 1 to March 31 for wintering wildlife, and Hawkins Range Reserve closes annually from December 1 to April 30 to protect habitat and important wildlife corridors. Source: https://www.ridgetorivers.org/trail-news/seasonal-ridge-to-rivers-trail-closures-start-in-december-to-prevent-damage-protect-wildlife-habitat/.

This is a major urban-ecology point. Boise’s outdoor lifestyle depends on trails, but wildlife also needs seasonal silence. A serious regional corpus has to treat recreation as both asset and pressure.

BOISE RIVER GREENBELT AND RIPARIAN HABITAT

The Boise River Greenbelt is often presented as an amenity, but ecologically it is a riparian habitat corridor running through an urbanizing valley. The City of Boise says it manages 29 miles of the Boise River Greenbelt and associated riverside habitat, plus ten native pollinator gardens throughout the city. Source: https://www.cityofboise.org/departments/parks-and-recreation/boise-river-community-habitat-enhancement/.

The river corridor matters because riparian habitat is biologically dense compared with surrounding drylands. Cottonwoods, willows, wetlands, ponds, side channels, and shaded banks support birds, beavers, insects, fish, amphibians, reptiles, and mammals. In a semi-arid valley, a river corridor is not decorative. It is a linear life-support system.

BOISE RIVER ENHANCEMENT NETWORK — THE CIVIC RESTORATION LAYER

The Boise River Enhancement Network is a nonprofit network dedicated to ecological enhancement of the Boise River watershed. Its own description is simple: it is a network of people who live, work, and play in the Boise River watershed and are dedicated to promoting ecological enhancement of the river. Source: https://www.boiseriverenhancement.org/.

A 2015 Boise State Public Radio report on BREN’s enhancement planning captured the underlying issue: the river needed help in water quality, fish habitat, riparian areas, and the river channel itself, and the network wanted cities, counties, farmers, and others who rely on the river to coordinate better. Source: https://www.boisestatepublicradio.org/environment/2015-06-22/group-wants-public-input-on-boise-river-enhancement-plan.

That collaboration piece matters. The Boise River does not belong to one agency. It crosses city boundaries, irrigation systems, private parcels, parks, agricultural lands, flood-control infrastructure, and recreation zones. Restoration requires a network because the river itself is a network.

GOLDEN EAGLE AUDUBON — COMMUNITY SCIENCE AND RESTORATION

Golden Eagle Audubon is Southwest Idaho’s chapter of the National Audubon Society, based in Boise. The U.S. Fish and Wildlife Service describes the organization as offering birding trips, monthly educational presentations, community science programs, the New Roots Program for refugee youth, and conservation and restoration of public lands. Source: https://www.fws.gov/partner/golden-eagle-audubon.

The organization also leads practical restoration. Golden Eagle Audubon says it restored more than 40 acres of important habitat along the Boise River between 2022 and 2024 and continues stewardship through weeding, watering, and planting. Source: https://www.goldeneagleaudubon.org/restoration/boise-riparian-corridor-project.

This is important because wildlife conservation in the Treasure Valley is not only state and federal action. It is also volunteer power, native plant propagation, bird monitoring, public education, youth engagement, restoration days, and community science. That civic layer is part of the region’s landscape infrastructure.

BOISE NATIONAL FOREST — THE MOUNTAIN WATERSHED BEHIND THE VALLEY

The Boise National Forest is the mountain watershed backdrop to the Treasure Valley. The Forest Service describes its watershed program mission as protecting, conserving, and restoring watersheds on the forest, and emphasizes that national forests and grasslands are major sources of municipal water supply across the United States. Source: https://www.fs.usda.gov/r04/boise/natural-resources.

For the Treasure Valley, this means the forest is not simply a recreation landscape north and east of Boise. It is the upstream water, fish, wildlife, fire, sediment, timber, road, and recreation system that feeds into the Boise River drainage. Snowpack, forest health, wildfire, erosion, road networks, fisheries, and reservoir inflows all tie the mountain landscape to the urban valley.

BOISE BASIN EXPERIMENTAL FOREST — LONG-TERM FOREST SCIENCE

The Boise Basin Experimental Forest is a deeper institutional asset in the landscape system. The Rocky Mountain Research Station says it is located in the Boise National Forest, was established in 1933 to study ponderosa pine management, and has supported long-term research and data collection on fire, soils, habitat types, and vegetation trends. Current research opportunities include ponderosa pine restoration, the wildland-urban interface, and impacts of recreation. Source: https://research.fs.usda.gov/rmrs/forestsandranges/locations/bbef.

This matters because the Treasure Valley’s landscape challenges are not short-term. Fire, forest health, recreation pressure, water supply, and the wildland-urban interface require long-term data. Experimental forests are the places where management assumptions get tested over decades.

BOISE AQUATIC SCIENCES LABORATORY — FISH, WATERSHEDS, AND RESTORATION SCIENCE

The U.S. Forest Service’s Boise Aquatic Sciences Laboratory is another hidden research institution relevant to the wildlife-landscape corpus. The Rocky Mountain Research Station describes work connected to shrubland restoration, wildlife ecology, and aquatic science, including reliable information on wildlife populations and habitats to support science-based natural resource decisions. Source: https://research.fs.usda.gov/rmrs/labs/locations/boise-aquatic-sciences-laboratory.

This belongs in the vertical because Boise is not just surrounded by natural resources; it hosts scientific infrastructure that helps manage those resources. That strengthens the city’s role as a regional environmental knowledge center.

FISHERIES: URBAN TROUT, NATIVE TROUT, AND COLD-WATER HEADWATERS

The Boise River is also a fisheries system. Idaho Fish and Game describes the Boise River from Middleton to Eagle Road as one of the finest urban trout rivers in the country, with wild trout and stocked hatchery rainbow and brown trout. Source: https://idfg.idaho.gov/ifwis/fishingplanner/water/72027.

Upstream, the North Fork Boise River supports native sportfish including redband trout, bull trout, and whitefish, along with nonnative brook and cutthroat trout. Source: https://idfg.idaho.gov/ifwis/fishingplanner/water/1156347437134.

The South Fork Boise River below Anderson Ranch Dam adds another layer. Idaho Fish and Game describes it as a nationally renowned tailwater trout fishery, the first river section in the Southwest Region managed as a trophy trout fishery, known for trophy rainbow trout, mountain whitefish, and large bull trout. Source: https://idfg.idaho.gov/blog/2021/06/wild-trout-and-wildfire-monitoring-trout-populations-south-fork-boise-river-after.

This matters because fisheries connect water temperature, reservoir operations, forest health, wildfire, sediment, angling economics, recreation, conservation, and native species protection. The river is not one thing. It is a managed urban fishery downstream and a cold-water native-fish system upstream.

INVASIVE SPECIES AND NOXIOUS WEEDS — THE LANDSCAPE DEGRADATION MECHANISM

Invasive plants are one of the biggest threats to southwestern Idaho landscapes. Idaho’s invasive species program states that Idaho has 74 weed species and four genera designated noxious by state law, with 57 of those species being terrestrial. Source: https://invasivespecies.idaho.gov/terrestrial-plants.

BLM Idaho’s weeds and invasives program explains that noxious weeds are invasive exotic plants designated by the State of Idaho as hazardous to public health, the environment, or the economy. Source: https://www.blm.gov/programs/weeds-and-invasives/weed-control-strategies/idaho.

For the Treasure Valley, this is not theoretical. Cheatgrass, medusahead, rush skeletonweed, and other invasive species alter fire behavior, reduce native plant diversity, degrade wildlife habitat, affect grazing, increase erosion, and make restoration more expensive. Invasive plants are the mechanism by which a one-time disturbance can become a long-term ecological conversion.

SAGEBRUSH RESTORATION — THE SLOW WORK OF REBUILDING THE WEST

Sagebrush restoration is one of the defining conservation challenges in the Treasure Valley. Boise State’s sagebrush research page describes sagebrush as the target of one of the largest restoration seeding efforts in the world and says university research is helping scientists understand the plant’s genetic footprint. Source: https://www.boisestate.edu/about/sagebrush/.

Boise’s own habitat restoration program emphasizes that sagebrush steppe is threatened and fragmented and that the city manages open space using science-based adaptive management. Source: https://www.cityofboise.org/departments/parks-and-recreation/open-space/habitat-restoration/.

This is the key point: sagebrush is slow infrastructure. It is habitat, winter forage, soil stabilization, bird cover, fire-regime moderator, and regional identity. You cannot rebuild mature sagebrush steppe quickly after fire, construction, or weed invasion. That delay is why land-use mistakes in sagebrush country can last for generations.

URBAN-WILDLIFE CONFLICT AND CARRYING CAPACITY

The Treasure Valley’s wildlife-landscape system is also limited by habitat carrying capacity. Idaho Fish and Game has publicly noted that Unit 39 has long been a productive mule deer unit, but biologists documented decreased fawn production, fewer fawns per doe, and lower winter fawn weights, suggesting the deer herd was approaching the top end of what the habitat can support. Source: https://idfg.idaho.gov/press/big-game-hunters-should-see-good-hunting-2022-few-exceptions.

This is one of the more serious ecological insights. People often assume more protected land always means more wildlife, but habitat quality, winter forage, fire recovery, invasive weeds, development pressure, and disturbance determine how many animals a landscape can actually support. Carrying capacity is not a slogan. It is the hard biological budget underneath the herd.

LAKE LOWELL, AGRICULTURE, AND WILDLIFE OVERLAP

Lake Lowell and Deer Flat show how irrigation infrastructure can become wildlife habitat. The lake was originally built as part of the Bureau of Reclamation irrigation system, yet today it is also the heart of a national wildlife refuge. This is why the Treasure Valley landscape is so layered: water projects built for farms became habitat for grebes, mallards, Canada geese, herons, egrets, songbirds, recreation users, and public education. U.S. Fish and Wildlife Service’s Deer Flat profile emphasizes both the Lake Lowell Unit and the Snake River Islands Unit as breeding, migratory, and wintering habitat. Source: https://www.fws.gov/refuge/deer-flat.

This creates a valuable cross-vertical connection. Agriculture, reclamation, wildlife, recreation, and federal refuge management are all sitting on the same physical water body.

THE CURRENT STRATEGIC READ

The Treasure Valley wildlife-landscape vertical has several core truths. The Boise River is the ecological artery. The foothills are the urban-wildlife boundary. Boise River WMA is the winter range engine. Highway 21 is the migration-conflict point. Morley Nelson is the raptor crown jewel. Deer Flat is the wetland and flyway anchor. Boise’s open-space system is the municipal conservation layer. Ridge to Rivers is the recreation-pressure management system. Boise National Forest is the mountain watershed source. Invasive grasses and wildfire are the conversion threat. Restoration science is the long game.

THE BIOLOGICAL AND PHYSICAL INVENTORY LAYER: THE TREASURE VALLEY IS NOT ONE HABITAT, BUT A STACK OF RIVER, FOOTHILL, SAGEBRUSH, CANYON, WETLAND, RESERVOIR, AGRICULTURAL EDGE, AND MOUNTAIN SYSTEMS

The Treasure Valley wildlife-landscape inventory has to start with habitat, not species names, because the species only make sense when attached to the landforms that support them. The Boise River Wildlife Management Area alone supports more than 300 wildlife species across shrub-steppe and riparian habitats in Ada, Boise, and Elmore counties, with Idaho Fish and Game identifying its primary purpose as winter habitat for mule deer and elk and year-round habitat for other wildlife. Source: https://idfg.idaho.gov/visit/wma/boise-river.

The major living systems are sagebrush steppe, Boise River riparian corridor, Boise Foothills shrubland, Snake River canyon cliffs, Deer Flat/Lake Lowell wetlands, reservoir margins, agricultural fields, and upstream Boise National Forest watersheds. The City of Boise says its open-space reserves are primarily sagebrush steppe and identifies sagebrush steppe as one of North America’s most imperiled ecosystems. Source: https://www.cityofboise.org/departments/parks-and-recreation/open-space/habitat-restoration/.

SAGEBRUSH STEPPE VEGETATION — THE BASE PLANT COMMUNITY

The native Boise Foothills plant community is dominated by big sagebrush and bitterbrush, with a diverse understory of native grasses, forbs, lichens, and mosses. This is the real baseline landscape before cheatgrass conversion, suburban development, repeated fire, and heavy disturbance. Source: https://www.blm.gov/sites/default/files/documents/files/A_Field_Guide_to_Plants_of_the_Boise_Foothills.pdf.

The core shrub layer includes big sagebrush, antelope bitterbrush, gray rabbitbrush, rubber rabbitbrush, and other dryland shrubs. Boise’s Aase’s onion monitoring report specifically identifies bitterbrush, big sagebrush, and gray rabbitbrush as common shrub species in lower Boise Foothills native plant communities. Source: https://www.cityofboise.org/media/16569/allaas_report_final_noappendices.pdf.

Native bunchgrasses are just as important as shrubs. Bluebunch wheatgrass is one of Idaho’s signature native bunchgrasses, and The Nature Conservancy describes it as drought-resistant, deep-rooted, and valuable forage for elk and deer. Source: https://www.nature.org/en-us/about-us/where-we-work/united-states/idaho/stories-in-idaho/native-plants/.

The degraded version of this landscape is cheatgrass-dominated foothills. Boise’s Weed Warriors material states that cheatgrass has outcompeted native grasses in many parts of the Boise Foothills, burns easily, thrives after wildfire, and can replace shrubs, native grasses, and forbs that recover slowly. Source: https://www.cityofboise.org/departments/parks-and-recreation/open-space/weed-warriors/resources/.

RARE AND LOCAL PLANTS — THE AASE’S ONION SIGNAL

Aase’s onion is one of the most important local plant signals because it ties Boise-area geology, foothill soils, development pressure, and rare-plant conservation together. The City of Boise’s Aase’s onion monitoring report places the species within lower Boise Foothills vegetation communities where bitterbrush, big sagebrush, gray rabbitbrush, native bunchgrasses, native forbs, and non-native weeds are measured as part of habitat condition. Source: https://www.cityofboise.org/media/16569/allaas_report_final_noappendices.pdf.

That makes Aase’s onion more than a plant name. It is an indicator of whether foothill remnants still retain native botanical structure or have crossed into degraded weedland.

TREES AND RIPARIAN VEGETATION — THE RIVER LAYER

The Boise River corridor supports a different plant world from the dry foothills. Cottonwoods, willows, riparian shrubs, wetland-edge vegetation, pond margins, and irrigated greenbelt landscapes create a linear habitat corridor through the metro. Deer Flat National Wildlife Refuge similarly combines open water, wetland edges, sagebrush uplands, grasslands, and riparian forests on Snake River islands. Source: https://npshistory.com/brochures/nwr/deer-flat-2016.pdf.

This riparian vegetation supports waterfowl, songbirds, raptors, beavers, muskrats, amphibians, fish, insects, and migratory birds. Boise’s river habitat program states that the city manages 29 miles of Boise River Greenbelt and associated riverside habitat, along with native pollinator gardens. Source: https://www.cityofboise.org/departments/parks-and-recreation/boise-river-community-habitat-enhancement/.

MAMMALS — BIG GAME, PREDATORS, SMALL MAMMALS, AND RIPARIAN SPECIES

The dominant big-game species in the Treasure Valley landscape are mule deer and elk. Idaho Fish and Game identifies Boise River WMA as supporting Idaho’s largest wintering mule deer herd, and its winter-range materials estimate thousands of mule deer and elk using the WMA seasonally. Source: https://idfg.idaho.gov/visit/wma/boise-river.

The Highway 21 migration corridor shows the scale of movement: U.S. Fish and Wildlife Service reports that roughly 8,000 to 9,000 mule deer and 1,800 to 2,400 elk from Boise River herds cross Highway 21 twice each year during seasonal migration. Source: https://www.fws.gov/story/2024-03/idahos-new-wildlife-overpass-improves-public-safety-and-wildlife-migration.

Predators in the broader Treasure Valley and surrounding public lands include mountain lions, black bears, coyotes, bobcats, foxes, badgers, and raptors as aerial predators. Boise River WMA’s official Idaho Fish and Game page lists black bear and mountain lion among species present in the WMA, alongside mule deer, elk, pronghorn, upland birds, and other wildlife. Source: https://idfg.idaho.gov/visit/wma/boise-river.

Small mammals are not background species in this region; they are the prey engine. In the Morley Nelson Snake River Birds of Prey NCA, the raptor system depends on ground squirrels, jackrabbits, and other burrowing mammals. BLM and NCA materials emphasize that the conservation area was created to protect birds of prey, their prey species, and the habitats they rely on. Source: https://birdsofpreyncapartnership.org/.

Riparian mammals include beaver, muskrat, and river otter in suitable river and wetland habitats. Deer Flat National Wildlife Refuge reports more than 30 mammal species, while BoiseDev’s 2025 refuge profile highlighted Deer Flat as home to more than 250 bird species and 30 mammal species. Source: https://boisedev.com/news/2025/04/17/one-of-the-oldest-national-wildlife-refuges-nestled-just-outside-boise/.

RAPTORS — THE SIGNATURE WILDLIFE CLASS OF SOUTHWEST IDAHO

Raptors are the signature wildlife group of the Treasure Valley region because of the Morley Nelson Snake River Birds of Prey National Conservation Area. BLM describes the area as 485,000 acres along 81 miles of the Snake River and home to the densest population of nesting birds of prey in North America and perhaps the world, with about 800 pairs of hawks, eagles, falcons, and owls nesting in lava cliffs and surrounding desert plateau. Source: https://www.blm.gov/visit/morley-nelson-snake-river-birds-prey-national-conservation-area.

The major raptor inventory includes golden eagle, bald eagle, prairie falcon, peregrine falcon, American kestrel, red-tailed hawk, Swainson’s hawk, ferruginous hawk, northern harrier, Cooper’s hawk, sharp-shinned hawk, osprey, turkey vulture, great horned owl, burrowing owl, barn owl, and other seasonal or migrating raptors. BLM’s raptor coloring book for Morley Nelson describes 16 species of diurnal raptors that live in the NCA either part of the year or year-round. Source: https://www.blm.gov/sites/default/files/documents/files/Media-Center_Public-Room_Idaho_Raptors-coloring-book.pdf.

The current research priorities show which raptors matter most for management. BLM’s FY2021 and FY2023 Morley Nelson manager reports describe studies focused on golden eagle nesting habitat suitability, nestling survival, prairie falcon Snake River Canyon occupancy and productivity, ferruginous hawk telemetry and productivity, and migratory bird mortality. Sources: https://www.blm.gov/sites/default/files/docs/2022-08/Birds%20of%20Prey%20NCA%20FY21%20Managers%20Report.pdf and https://www.blm.gov/sites/default/files/docs/2024-06/MNSRBOPNCA%20Managers%20Report%20FY23%20Final.pdf.

WATERFOWL, WETLAND BIRDS, AND THE PACIFIC FLYWAY LAYER

Deer Flat National Wildlife Refuge is the major waterfowl and wetland-bird anchor of the western Treasure Valley. U.S. Fish and Wildlife Service says the refuge supports bald eagles and other raptors, migrating and wintering waterfowl, and western and Clark’s grebes at one of the three largest nesting colonies in Idaho. Source: https://www.fws.gov/refuge/deer-flat.

The refuge’s species page names seasonal birds including western grebes, bald eagles, white pelicans, Canada geese, mallards, and other migratory birds. Source: https://www.fws.gov/refuge/deer-flat/species.

This means the Treasure Valley bird inventory is not just raptors. It includes waterfowl, colonial nesting birds, shorebirds, songbirds, riparian migrants, grebes, pelicans, herons, egrets, geese, ducks, and wintering bald eagles. Deer Flat’s older refuge brochure describes the area as a significant resting and wintering area for birds migrating along the Pacific Flyway, especially mallards and Canada geese. Source: https://npshistory.com/brochures/nwr/deer-flat-2016.pdf.

UPLAND BIRDS AND GRASSLAND-BRUSHLAND SPECIES

The upland bird layer includes chukar, gray partridge, California quail, dusky grouse, ruffed grouse, mourning dove, and sagebrush-associated songbirds. Idaho Fish and Game’s Boise River WMA page lists chukar, gray partridge, California quail, dusky grouse, ruffed grouse, and mourning dove among species associated with the WMA. Source: https://idfg.idaho.gov/visit/wma/boise-river.

The deeper reason these birds matter is that they reveal habitat diversity. Chukar point toward rocky canyon and dry slope environments. Quail and doves connect to agricultural edge, riparian thickets, and lower-elevation habitat. Grouse point toward higher-elevation forest and shrubland transitions. The bird inventory is a map of habitat complexity.

FISH — URBAN TROUT, NATIVE TROUT, BULL TROUT, WHITEFISH, AND RESERVOIR SPECIES

The Boise River is a fisheries corridor from the city to the mountains. Idaho Fish and Game calls the Boise River from Middleton to Eagle Road one of the finest urban trout rivers in the country, with wild trout and stocked hatchery rainbow and brown trout. Source: https://idfg.idaho.gov/ifwis/fishingplanner/water/72027.

Upstream, the fish inventory becomes more native and cold-water oriented. Idaho Fish and Game’s North Fork Boise River page lists native sportfish including redband trout, bull trout, and whitefish, with brook trout and cutthroat trout also present. Source: https://idfg.idaho.gov/ifwis/fishingplanner/water/1156347437134.

Bull trout are especially important because Idaho Fish and Game identifies bull trout as native and no-harvest. Source: https://idfg.idaho.gov/fish/identification/resident.

The South Fork Boise River below Anderson Ranch Dam is another major fishery, with Idaho Fish and Game describing it as a nationally renowned tailwater trout fishery known for trophy rainbow trout, mountain whitefish, and large bull trout. Source: https://idfg.idaho.gov/blog/2021/06/wild-trout-and-wildfire-monitoring-trout-populations-south-fork-boise-river-after.

REPTILES, AMPHIBIANS, AND SMALLER NON-GAME WILDLIFE

The dry foothills, sagebrush flats, basalt outcrops, wetland margins, and river corridors support reptiles and amphibians that rarely receive the same attention as deer, elk, or raptors. Idaho Fish and Game’s Species Catalog is the most comprehensive repository for Idaho fish, wildlife, and plant diversity, and it functions as the proper source for county-level or observation-level species confirmation. Source: https://idfg.idaho.gov/species/.

For the Treasure Valley corpus, the reptiles and amphibians seem like they belong to specific habitat slices: lizards and snakes in sagebrush, grassland, basalt, and canyon habitats; frogs, toads, and salamanders in riparian, wetland, pond, irrigation, and reservoir-edge environments. Seeking further discovery: county-level species directly from Idaho Fish and Game’s Species Catalog instead of guessing locality for each species.

GEOLOGY — WESTERN SNAKE RIVER PLAIN, BOISE FRONT, TERRACES, BASALT, AND ANCIENT LAKE SEDIMENTS

The Treasure Valley landscape sits within the western Snake River Plain, not the eastern Yellowstone-hotspot track plain. USGS describes the Snake River Plain as a broad “smile” across southern Idaho and notes that the Eastern Snake River Plain is closely tied to the Yellowstone Hotspot track, while the Western Snake River Plain has a different geologic story. Source: https://www.usgs.gov/observatories/yvo/news/snake-river-plain-a-tale-two-basins.

The Boise Valley itself was shaped by river entrenchment after the western Snake River Plain filled with lake sediments. BLM’s “Geology of Southwest Idaho” explains that the Boise Valley formed as the Boise River cut down through sediments deposited by ancient Lake Idaho beginning around two million years ago, creating terrace sequences still visible across the valley. Source: https://www.blm.gov/sites/default/files/documents/files/MediaCenter_PublicRoom_Idaho_Geology-of-%20SouthwestIdaho.pdf.

The Idaho Geological Survey’s “Geology and Geomorphology of the Boise Valley and Adjoining Areas” is the deeper technical anchor for Boise Valley landforms, covering the lower Boise River valley from the mountain front to the Snake River confluence. Source: https://www.idahogeology.org/pub/Bulletins/B-29_BoiseValley.pdf.

THE BONNEVILLE FLOOD AND SNAKE RIVER CANYON LANDSCAPE

The Snake River canyon south of Boise carries evidence of the Bonneville Flood, one of the enormous late-Pleistocene floods that shaped parts of southern Idaho. Morley Nelson summary material notes that about 14,000 years ago, Lake Bonneville overtopped Red Rock Pass and poured into the Snake River Plain, leaving boulders, box canyons, and other flood evidence in the Snake River area. Source: https://en.wikipedia.org/wiki/Morley_Nelson_Snake_River_Birds_of_Prey_National_Conservation_Area.

This matters because raptor habitat is partly geological. The Snake River canyon’s lava cliffs, crevices, updrafts, canyon walls, plateau soils, and prey-supporting sagebrush lands form the physical architecture of the bird-of-prey system.

RESERVOIRS AND WATER BODIES — LUCKY PEAK, ARROWROCK, AND LAKE LOWELL

The major water bodies in this vertical are the Boise River, Lucky Peak Reservoir, Arrowrock Reservoir, Anderson Ranch Reservoir upstream, Lake Lowell, and the Snake River. Boise River WMA is situated along Lucky Peak and Arrowrock reservoirs, making those reservoirs part of the winter-range and riparian landscape rather than merely recreation sites. Source: https://idfg.idaho.gov/visit/wma/boise-river.

Lake Lowell is the heart of Deer Flat National Wildlife Refuge. Visit Idaho describes the Lake Lowell Unit as more than 10,500 acres, including nearly 9,000-acre Lake Lowell and surrounding lands, while the Snake River Islands Unit includes more than 1,000 acres on 104 islands across 113 river miles. Source: https://visitidaho.org/things-to-do/wildlife-viewing-birding/deer-flat-national-wildlife-refuge/.

WHY THIS MATTERS

The wildlife-landscape vertical has real biological and physical depth. The Treasure Valley has sagebrush steppe, riparian forest, basalt canyon, ancient lake sediment, river terraces, reservoirs, wetlands, winter range, raptor cliffs, invasive grasslands, native plant remnants, urban fishery, mountain headwaters, and agricultural edge.