Idaho — The Gem State

The Idaho Constitution was adopted by constitutional convention on August 6, 1889, ratified by voters on November 5, 1889, and approved by Congress on July 3, 1890 when Idaho became the 43rd state. Two principles animated the drafters: freedom and common welfare. The preamble reads: "We, the people of the state of Idaho, grateful to Almighty God for our freedom, to secure its blessings and promote our common welfare do establish this Constitution." Idaho State Legislature — official constitution ↗

The document has 20 articles. Article XV embeds the prior appropriation doctrine for water rights — "first in time, first in right" — recognizing from day one that water governance was the defining challenge of an arid state. The prior appropriation doctrine itself was adopted by the Idaho Territorial Legislature in 1881, nine years before statehood, and is governed today by Title 42 of the Idaho Code. Spudman — prior appropriation history ↗ · Idaho Legal Services Authority ↗

The constitution has been amended over 140 times. Two attempts to entirely rewrite it have failed. Amendments require a two-thirds vote in both chambers of the legislature and approval by a majority of voters at the next general election. 50 Constitutions — Idaho ↗ · State Court Report — analysis March 2025 ↗

Idaho operates under a Republican trifecta and Republican triplex as of March 2026 — the Republican Party controls the governor's office, secretary of state, attorney general, and both chambers of the state legislature. Ballotpedia ↗

Idaho's population reached approximately 2.03 million in 2025, making it the second fastest growing state in the nation trailing South Carolina by one-tenth of a percentage point. The state grew 1.4% in 2025 — 28,861 new residents. Three of every four new residents came from in-migration rather than births. Idaho Department of Labor — March 31, 2026 ↗ · Spokesman-Review — April 2026 ↗

36 of Idaho's 44 counties grew in 2025 — 80% of counties expanding, compared with 60% nationally. Ada, Canyon, Kootenai, Bonneville, and Twin Falls each added at least 1,000 residents. Ada County alone added 10,916 people — a 2% increase to reach nearly 550,000 residents. Canyon County grew 2.9% — 7,679 people — to reach 275,125. Ada and Canyon together account for more than 40% of Idaho's total population. Two of every three new residents in 2025 settled in the state's southwest. Big Country News Connection citing US Census ↗

The Boise Metropolitan Statistical Area — Ada, Canyon, Boise, Gem, and Owyhee counties — grew at 2.2%, ranking it the 13th fastest growing market in the country and the second fastest in the West, trailing only St. George, Utah. Boise, Coeur d'Alene, and Idaho Falls MSAs all ranked in the top 50 nationally for one-year population growth in 2025. Since 2020, Ada, Canyon, and Kootenai counties added over 109,000 residents combined — 60% of statewide growth. Spokesman-Review ↗

Idaho divides into three primary geographic regions. The Rocky Mountains region occupies the north and central portions — the panhandle, the Bitterroot Range, and the central wilderness containing Borah Peak at 12,662 feet, the state's highest point. More than 40 peaks exceed 10,000 feet. The Columbia Plateau spreads across the southern state, formed by volcanic eruptions between 15,000 and 2,000 years ago — almost entirely flat, hosting the Snake River Plain and Idaho's agricultural heartland. The Basin and Range Province occupies the southeast, containing the Bear River basin and grassy plateaus. Britannica ↗ · World Atlas ↗

The Snake River is the defining physical feature of southern Idaho — 779 miles through the state from the Wyoming border to the Washington border, the longest river in Idaho and the largest tributary of the Columbia River. Its course through Idaho includes Hells Canyon at 7,900 feet deep — the deepest river gorge in North America, deeper than the Grand Canyon — and Shoshone Falls at 212 feet. The Snake River Plain extends east-to-west across Idaho from Yellowstone National Park through the Boise area. Britannica ↗

Idaho has approximately 93,000 miles of rivers and streams and approximately 2,000 lakes. Lake Pend Oreille in the northern panhandle is the largest and deepest — 148 square miles, depth 1,140 feet. The Eastern Snake Plain Aquifer underlies roughly 10,000 square miles of the Snake River Plain — one of the largest aquifer systems in the United States and the primary water source for agricultural and municipal users across the Magic Valley. World Atlas ↗

The Frank Church–River of No Return Wilderness — 2,366,757 acres in central Idaho — is the largest contiguous federally managed wilderness in the lower 48 states. Designated by Congress in 1980, renamed in 1984 in honor of Idaho Senator Frank Church. The Salmon River Canyon within it is one of the deepest gorges in North America. Bureau of Land Management — official ↗

Water law is the legal foundation underneath every agricultural, industrial, and municipal operation in Idaho. The prior appropriation doctrine — adopted by the Idaho Territorial Legislature in 1881 and embedded in Article XV of the Idaho Constitution — governs the allocation of all surface and groundwater. When supply is insufficient to meet all demands, available water goes to the oldest water right first, regardless of who owns the land adjacent to the source. Spudman ↗ · Idaho Legal Services Authority ↗

Title 42 of the Idaho Code defines five elements of a valid water right: source, point of diversion, place of use, purpose of use, and quantity. Recognized beneficial uses include irrigation, domestic supply, municipal supply, industrial use, hydropower generation, fish propagation, and minimum stream flows. Waste of water is prohibited under Idaho Code § 42-101. Idaho Legal Services Authority ↗

The Snake River Basin Adjudication — initiated in 1987 through the Fifth Judicial District Court in Twin Falls — was the most consequential water rights proceeding in Idaho history. Covering 87% of Idaho's land area, the adjudication quantified approximately 167,000 individual water rights over 27 years. The Final Unified Decree was signed August 25, 2014. A peer-reviewed economic study found the adjudication generated present-value benefits of at least $402.7 million against a one-time cost of $94 million, and caused a 140% increase in the frequency of water right trades. Idaho IDWR — SRBA official ↗ · ScienceDirect — peer-reviewed study ↗

The Eastern Snake Plain Aquifer — underlying roughly 10,000 square miles — is hydraulically connected to the Snake River. Groundwater pumping reduces spring discharge into the river, which affects surface water rights held by downstream irrigators and ecological flows for salmon and trout. The Idaho Department of Water Resources has administered a groundwater management area for portions of the aquifer since 2007. Idaho water restrictions context ↗ · Boise State Public Radio ↗

Idaho's GDP reached $129,018.2 million in 2024 — up from $88 billion in 2020, a gain of approximately 47% in four years. Real GDP (chained 2017 dollars) was $99.6 billion. Private industries contributed $115.3 billion. The state closed FY2025 with a balanced budget and $345 million on the bottom line — withholding collections up 5.9%, gross sales tax revenues up 3.7%. Unemployment held at 3.6%. FRED / BEA — Idaho GDP ↗ · Governor's Office — July 2025 ↗

Idaho exports goods and services to 205 nations. Canada has been the largest trading partner at $1.2 billion annually since 2014. International exports support approximately 33,000 Idaho jobs — 4% of total employment. GDP grew 48.7% between 2015 and 2024, averaging 4% annually. Idaho Department of Labor — November 2025 ↗

Agriculture is Idaho's oldest and still most foundational industry. The state ranks in the top ten nationally in nearly 30 of the 168 commodities it produces. Total cash receipts reached $11.3 billion in 2024 — a 4% increase over 2023. Net farm income was $3.3 billion — 37% above the 10-year average. AgProud citing USDA NASS ↗ · Idaho State Department of Agriculture — statistics ↗

Boise's technology industry grew 32.4% between 2016 and 2021 — outpacing Texas and New York over that period. Idaho led the entire United States in tech salary growth over a 10-year period with a 26% increase. Boise wages specifically jumped 10.3% in a single year. The Idaho Technology Council documented a 28.89% increase in software developer jobs and a 56.54% surge in other computer occupations. Nucamp — February 2026 ↗

The semiconductor industry is the defining economic story of modern Idaho. In 2022 Idaho's semiconductor sector generated $2.5 billion in gross state product, creating 12,300 high-paying jobs with an average wage of $135,000. With Micron's CHIPS Act fabs under construction and Meta's AI data center opening in adjacent Kuna in late 2026, the Treasure Valley is becoming one of the most concentrated zones of AI physical infrastructure in the United States. Boise State University — August 2024 ↗

Idaho's electricity profile is dominated by clean hydropower. Renewable energy sources accounted for approximately 68% of Idaho's electricity generation in 2023 — hydropower contributing about 54% and wind energy around 16%. Idaho Power, the state's largest utility, operates 17 hydroelectric plants on the Snake River. The company set a goal of 100% clean company-owned generation by 2045. Idaho Power — Clean Today, Cleaner Tomorrow ↗

Idaho Power's 2025 Integrated Resource Plan — a 20-year roadmap — calls for adding 1,445 MW of solar, 885 MW of battery storage, 700 MW of wind, 611 MW of converted coal to gas, and 550 MW of new natural gas through 2045. The plan was revised from earlier versions due to a dramatic increase in electricity demand driven by AI data centers and semiconductor fabrication plants. Data centers nationally used 183 terawatt-hours of electricity in 2024. Idaho Power currently integrates 725 MW of wind and 780 MW of solar on its system. Idaho Power 2025 IRP — June 2025 ↗ · BoiseDev — November 2025 ↗

The Boardman-Hemingway transmission line — linking the Treasure Valley with abundant hydroelectricity from the Pacific Northwest — began construction in 2025 and is expected to come online by end of 2027 after decades of planning. The Snake River Plain hosts 541 wind turbines with a total capacity of 973 megawatts, generating approximately 15% of Idaho's in-state electricity — enough to power 224,000 homes. Idaho Power — wind integration ↗ · Idaho Conservation League ↗

Idaho's public education system serves over 300,000 K-12 students across traditional districts and 76 public charter schools serving more than 42,000 students. The Idaho State Board of Education makes policy for K-20 public education. In FY2024 Idaho spent $11,167 per pupil in K-12 public schools — last among all 50 states and the District of Columbia. The national average was $17,499. Despite this, state support for public education increased nearly 70% in a few short years under Governor Little. Idaho Capital Sun — April 22, 2026 ↗ · Idaho State Board of Education Fact Book 2024 ↗

All eight public colleges and universities reported enrollment increases for fall 2025. Statewide higher education headcount is up 19.1% since fall 2020. Boise State University set a record 28,519 students in fall 2025 — the largest incoming class in its history. The University of Idaho reported record undergraduate enrollment. Idaho State University reached its highest enrollment in 13 years. Idaho Education News — November 2025 ↗

Every era of Idaho history left permanent marks on the land, the law, and the economy. This timeline runs from the first documented territorial event through the present semiconductor and AI investment boom — sourced to primary documents at every entry.

Idaho's statewide median home price reached $512,500 as of November 2025 — a 9.3% year-over-year increase. Boise's median home price sits approximately $525,000, roughly 25% above the national average. Ada County reached a November 2025 record median of $564,000 — up 7.43% year-over-year. Canyon County's median sold price hit $425,000 — up 6.41%. Eagle set a November 2025 monthly record median of $1 million — the highest ever recorded for that market. We Know Boise — Ada and Canyon County REALTORS ↗

Boise's median home price was $300,000 in 2019. It reached $524,000 by summer 2022. The rapid appreciation has made housing affordability the primary challenge for the region's workforce growth, even as Boise remains substantially more affordable than Seattle, Portland, and San Francisco. The Boise MSA rental vacancy rate in Q1 2025 was 3.44% combined across Ada and Canyon counties. Waypoint Idaho ↗

This page is a node in the Boise Standard knowledge graph. Every link below is a typed edge connecting the Idaho state entity to a parent, sibling, or child node in the graph. The value of a citadel page is not the content alone — it is the connections.

Every claim on this page is traceable to a primary or authoritative source. Every URL below is live. Organized by category.