Area, 83,557 sq mi (216,413 sq km). Pop. (2000) 1,293,953, a 28.5% increase since the 1990 census. Capital and largest city, Boise. Statehood, July 3, 1890 (43d state). Highest pt., Borah Peak, 12,662 ft (3,862 m); lowest pt., Snake River, 710 ft (217 m). Nickname, Gem State. Motto, Esto Perpetua [It Is Perpetual]. State bird, mountain bluebird. State flower, syringa. State tree, white pine. Abbr., ID
Much of Idaho has an unspoiled beauty, with rugged slopes and towering peaks, a vast expanse of timberland, scenic lakes, wild rivers, cascades, and spectacular gorges. From the northern Panhandle, where Idaho is about 45 mi (72 km) wide, the state broadens south of the Bitterroot Range to 310 mi (499 km) in width. The Snake River flows in a great arc across S Idaho; with its tributaries the river has been harnessed to produce hydroelectric power and to reclaim vast areas of dry but fertile land. To the north of the Snake River valley, in central and north central Idaho, are the massive Sawtooth Mts. and the Salmon River Mts., which shelter magnificent wilderness areas, including the Frank Church River of No Return Wilderness, the Selway Bitterroot Wilderness Area, and the Idaho Primitive Area.
In the central and north central regions and in the Panhandle there are tremendous expanses of national forests covering approximately two fifths of the state and constituting one of the largest areas of national forests in the nation. Idaho's jagged granite peaks include Mt. Borah, which is 12,662 ft (3,859 m) high. Hells Canyon, which at one point is 7,900 ft (2408 m) below the mountaintops, is the deepest gorge in North America. The state also contains Craters of the Moon National Monument and a protected grove of ancient cedars at Upper Priest Lake.
Rushing rivers such as the Salmon and the Clearwater, and many lakes, notably Lake Pend Oreille, Lake Coeur d'Alene (often described as one of the world's loveliest), and Priest Lake, as well as the state's mountain areas, make Idaho a superb fish and game preserve and vacation land. The state is especially inviting to campers, anglers, and hunters (Idaho has one of the largest elk herds in the nation). The state's climate ranges from hot summers in the arid southern basins to cold, snowy winters in the high wilderness areas of central and northern Idaho. The capital and largest city is Boise; other cities of importance are Pocatello and Idaho Falls.
Manufacturing has recently supplanted agriculture as the most important sector of Idaho's economy. Cattle and dairy goods are among the leading agricultural products. Idaho's chief crops are potatoes (for which the state, easily the nation's largest producer, is famous), hay, wheat, peas, beans, and sugar beets. Electronic and computer equipment, processed foods, lumber, and chemicals are the major manufactured items.
The unspoiled quality of much of Idaho's land has nourished one of the youngest of Idaho's businesses—the tourist trade. Sun Valley, one of the nation's best-known year-round vacation spots, is an example of the development of resorts in Idaho. Mining, once the major source of income, and still economically important, produces phosphates, gold, silver, molybdenum, antimony, lead, zinc, and other minerals.
Idaho's constitution, adopted in 1889, became effective in 1890 upon statehood. The state's chief executive is a governor elected for a term of four years. The legislature consists of a 42-member senate and an 84-member house of representatives. The state also elects two representatives and two senators to the U.S. Congress and has four electoral votes.
Idaho is a Republican state in national politics but had Democratic governors from 1970 to 1994. Cecil D. Andrus, elected governor in 1970 and reelected in 1974, served as secretary of the interior during the Carter administration; he was elected governor again in 1986 and 1990. Republican Phil Batt, elected governor in 1994, was succeeded by Republican Dirk Kempthorne, elected in 1998 and reelected in 2002. Kempthorne was appointed secretary of the interior in 2006. He was succeeded as governor by Lt. Gov. James E. Risch, also a Republican, and Republican Butch Otter was elected to the post later in the year.
Outstanding among Idaho's institutions of higher learning are the Univ. of Idaho, at Moscow; Idaho State Univ., at Pocatello; and Boise State Univ., at Boise.
Probably the first nonnatives to enter the area that is now Idaho were members of the Lewis and Clark expedition in 1805. They were not far ahead of the fur traders who came to the region shortly thereafter. A Canadian, David Thompson of the North West Company, established the first trading post in Idaho in 1809. The next year traders from St. Louis penetrated the mountains, and Andrew Henry of the Missouri Fur Company established a post near present-day Rexburg, the first American trading post established in the area.
In this period the fortunes of the Idaho region were wrapped up with those of the Columbia River region, and the area encompassed by what is now the state of Idaho was part of Oregon country, held jointly by the United States and Great Britain from 1818 to 1846. Fur traders in an expedition sent out by John Jacob Astor came to the Snake River region to trap for furs after having established (1811) a trading post at Astoria on the Columbia River. In 1821 two British trading companies operating in the Idaho region, the North West Company and the Hudson's Bay Company, were joined together as the Hudson's Bay Company which, after 1824, came into competition with American mountain men also trapping in the area. By the 1840s the two groups had severely depleted the region's fur supply.
Gold, Settlement, and ResistanceIn 1846 the United States gained sole claim to Oregon country south of the 49th parallel by the Oregon Treaty with Great Britain. The area was established as a territory in 1848. Idaho still had no permanent settlement when Oregon Territory became a state in 1859 and the eastern part of Idaho was added to Washington Territory. A Mormon outpost founded at Franklin in 1860 is considered the first permanent settlement, but it was not until the discovery of gold that settlers poured into Idaho.
Gold was discovered on the Clearwater River in 1860, on the Salmon in 1861, in the Boise River basin in 1862, and gold and silver were found in the Owyhee River country in 1863. The usual rush of settlers followed, along with the spectacular but ephemeral growth of towns. Most of these settlements are only ghost towns now, but the many settlers who poured in during the gold rush—mainly from Washington, Oregon, and California, with smaller numbers from the east—formed a population large enough to demand new government administration, and Idaho Territory was set up in 1863.
Native Americans, mostly Kootenai, Nez Percé, Western Shoshone, Bannock, Coeur d'Alene, and Pend d'Oreille, became upset by the incursion of settlers and some resisted violently. The federal government had subdued many of these groups by 1858, placing them on reservations. The Bannock were defeated in 1863 and again in 1878. In 1876-77 the Nez Percé, led by Chief Joseph, made their heroic but unsuccessful attempt to flee to Canada while being pursued by U.S. troops.
Development and DisputesA new mining boom started in 1882 with the discovery of gold in the Coeur d'Alene, and although the gold strike ended in disappointment, it prefaced the discovery there of some of the richest silver mines in the world. Coeur d'Alene and Kellogg became notable mining centers, and the Bunker Hill and Sullivan (a lead mine) became extremely famous mines. Severe labor troubles in the mines at the end of the century led to political uprisings. Frank Steunenberg, who as governor had used federal troops to put down the uprisings, was assassinated in 1905. The trial of William Haywood and others accused of involvement in the murder drew national attention and marked the beginning of the long career of William E. Borah (who had prosecuted the mine leaders) as an outstanding Republican party leader in the state and nation.
The late 19th cent. also witnessed the growth of cattle and sheep ranching, along with the strife that developed between the two groups of ranchers over grazing areas. The coming of the railroads (notably the Northern Pacific) through Idaho in the 1880s and 90s brought new settlers and aided in the founding of such cities as Idaho Falls, Pocatello, and American Falls.
Putting Water and the Atom to WorkExpanding Idaho farming led to private irrigation projects. Some of these aroused public opposition, which led to establishment of state irrigation districts under the Carey Land Act of 1894. The Reclamation Act of 1902 brought direct federal aid. Notable among public reclamation works are the Boise and Minidoka projects. Both public and private, these have also helped to increase the development of Idaho's enormous hydroelectric potential. Further private hydroelectric projects along the Snake River were put into operation between 1959 and 1968.
In 1949 the Atomic Energy Commission built the National Reactor Testing Station in SE Idaho. Now known as the Idaho National Engineering Laboratory, the facility in 1955 provided energy for nearby Arco, the first American town to be lighted by electricity from a nuclear power plant.
Idaho suffered during the recession of the early 1980s but rebounded later in the decade by attracting new business, including high-technology firms. The growth of the winter sports industry has helped make Idaho a leading tourist state. These improvements in its economy made Idaho one of the nation's fastest-growing states in population between 1990 and 2000.
See Federal Writers' Project, Idaho (1938, rev. ed. 1950); M. W. Wells, Idaho: An Illustated History (1980).
State (pop., 2000: 1,293,953), northwestern U.S. It is bordered by Canada and the U.S. states of Montana, Wyoming, Utah, Nevada, Oregon, and Washington. It covers 83,574 sq mi (216,456 sq km). Its capital is Boise. Idaho is dominated by the Rocky Mountains, which extend from the Canadian border to south-central Idaho and along the Wyoming border. Its most extensive valley surrounds the Snake River, which flows through Hells Canyon, the deepest gorge in North America. First occupied by American Indians, the region was explored by the Lewis and Clark Expedition in 1805. It was part of the disputed Oregon Country that passed to the U.S. when Britain relinquished its claims by treaty in 1846. Discovery of gold in 1860 brought an influx of settlers. It became Idaho Territory in 1863 and was admitted to the Union as the 43rd state in 1890. Labour protests during 1890–1910 involving the Industrial Workers of the World erupted frequently. During the late 20th century, Idaho developed its agriculture and industry and promoted its natural wilderness.
Learn more about Idaho with a free trial on Britannica.com.
According to the United States Census Bureau, in 2007 the population for Idaho was 1,499,402. The state's postal abbreviation is ID. Idaho's nickname is the Gem State because of its abundance of natural resources. The state motto is Esto Perpetua (Latin for "Let it be forever").
Idaho borders six states and one Canadian province. The states of Washington and Oregon are to the west, Nevada and Utah are to the south, and Montana and Wyoming are to the east. Idaho also shares a short border with Canada: the province of British Columbia is to the north. The landscape is rugged with some of the largest unspoiled natural areas in the United States. It is a Rocky Mountain state with abundant natural resources and scenic areas. The state has snow-capped mountain ranges, rapids, vast lakes and steep canyons. The waters of Snake River rush through Hells Canyon, the deepest canyon in the United States. Shoshone Falls plunges down rugged cliffs from a height greater than that of Niagara Falls. The major rivers in Idaho are the Snake River, the Clark Fork/Pend Oreille River, the Clearwater River and the Salmon River. Other significant rivers include the Coeur d'Alene/Spokane River, the Boise River and the Payette River. The Port of Lewiston, at the confluence of the Clearwater and the Snake Rivers is the farthest inland seaport in the Pacific Northwest.
Idaho's highest point is Borah Peak, , in the Lost River Range north of Mackay. Idaho's lowest point, , is in Lewiston, where the Clearwater River joins the Snake River and continues into Washington.
Southern Idaho, including the Boise metropolitan area, Idaho Falls, Pocatello, and Twin Falls are in the Mountain Time Zone. (A legislative oddity (§ 264) theoretically places this region in the Pacific Time Zone, but this error is not widely known and is universally ignored.) Areas north of the Salmon River, including Coeur d'Alene, Moscow, Lewiston, and Sandpoint are in the Pacific Time Zone and revolve commercially and culturally around Spokane, Washington
Climate in Idaho can be hot, although extended periods over for the maximum temperature are rare. Hot summer days are tempered by the low relative humidity and cooler evenings during summer months since, for most of the state, the highest diurnal difference in temperature is often in the summer. Winters can be cold, although extended periods of bitter cold weather below zero are unusual.
Humans may have been present in the Idaho area as long as 14,500 years ago. Excavations at Wilson Butte Cave near Twin Falls in 1959 revealed evidence of human activity, including arrowheads, that rank among the oldest dated artifacts in North America. Native American tribes predominant in the area included the Nez Perce in the north and the Northern and Western Shoshone in the south.
Idaho, as part of the Oregon Country, was claimed by both the United States and Great Britain until the United States gained undisputed jurisdiction in 1846. Between then and the creation of the Idaho Territory in 1863, parts of the present-day state were included in the Oregon, Washington, and Dakota Territories. The new territory included most of present-day Idaho, Montana, and Wyoming. The first organized communities, within the present borders of Idaho, were established in 1860. After some tribulation as a territory, including the chaotic transfer of the territorial capital from Lewiston to Boise, disenfranchisement of the large Mormon minority and a federal attempt to split the territory between Washington Territory and the state of Nevada, Idaho achieved statehood in 1890. The economy of the state, which had been primarily supported by metal mining, shifted towards agriculture and tourism.
In recent years, Idaho has expanded its commercial base as a tourism and agricultural state to include science and technology industries. Science and technology have become the largest single economic center (over 25% of the state's total revenue) within the state and are greater than agriculture, forestry and mining combined.
The Idaho State Historical Society preserves and promotes Idaho’s cultural heritage.
Congress ultimately decided to name the area Colorado Territory when it was created in February 1861.However, the name "Idaho" did not go away. The same year Congress created Colorado Territory, a county called Idaho County was created in eastern Washington Territory. The county was named after a steamship named Idaho, which was launched on the Columbia River in 1860. It is unclear whether the steamship was named before or after Willing's claim was revealed. Regardless, a portion of Washington Territory, including Idaho County, was used to create Idaho Territory in 1863.
Despite this lack of evidence for the origin of the name, many textbooks well into the 20th century repeated as fact Willing's account that the name "Idaho" derived from the Shoshone term "ee-da-how".
Chief Joseph Seltice, of the Coeur d'Alene Tribal Nation, posits another possible origin of the name. In his history of the tribe, Saga of the Coeur d'Alene Indians, he writes:
Some sources claim that the name "Idaho" comes from an Indian word, "Ee-dah-how," meaning "Gem of the Mountains." This expression may have come from some other Tribe, and it would have a different meaning for them than it would for the Coeur d'Alenes.
As the Coeur d'Alenes understood the word "Idaho," it would be more correctly pronounced "Ah-d'Hoo." It means "greetings by surprise," indicating friendship, but surprise.
The first syllable conveys to the mind, "All are welcome, from wherever you come; but keep the friendly peace. We welcome you with out-stretched arms, and this entitles us to permanent friendship."
The last syllable is a surprise and exclamation point. The expression means that all are welcome, "though we are surprised to see so many different strangers. The first dawn of day welcomes you as the sun rises." This expression was used by many of the Coeur d'Alenes on the Bitterroot Mountains to greet all who come.
So to all who read these words: "Welcome, with open arms! We're just surprised that there are so many of you!"
This made Idaho the sixth fastest-growing state after Arizona, Nevada, Florida, Georgia, and Utah. From 2004 to 2005, Idaho grew the third-fastest, surpassed only by Nevada and Arizona.
Nampa, the state's second largest city, has experienced particularly strong growth in recent years. According to census estimates Nampa has grown 22.1% to nearly 65,000 residents between 2000 and 2003. As of 2007, the population in Nampa was estimated at 84,000. Growth of 5% or more over the same period has also been observed in Caldwell, Coeur d'Alene, Meridian, Post Falls and Twin Falls. 
Since 1990, Idaho's population has increased by 386,000 (38%).
The Boise Metropolitan Area (officially known as the Boise City-Nampa, ID Metropolitan Statistical Area) is Idaho's largest metropolitan area. Other metropolitan areas in order of size are Coeur d'Alene, Idaho Falls, Pocatello and Lewiston.
As of 2006, six official micropolitan statistical areas are based in Idaho. Twin Falls is the largest of these.
The center of population of Idaho is located in Custer County, in the town of Stanley.
The largest reported ancestries in the state are: German (18.9%), English (18.1%), Irish (10%), American (8.4%), Norwegian (3.6%), Swedish (3.5%).
According to the 15th annual Idaho Public Policy study (
, 2004) by the Social Science Research Center at BSU, the ambiguous religious affiliations of Idahoans break down roughly as follows.
The largest denominations by number of adherents in 2000 were the Church of Jesus Christ of Latter-day Saints with 311,425; the Roman Catholic Church with 130,847; the Assemblies of God with 18,745; and the United Methodist Church with 17,683.
Gross state product for 2004 was US$43.6 billion. The per capita income for 2004 was US$26,881. Idaho is an important agricultural state, producing nearly one third of the potatoes grown in the United States.
Important industries in Idaho are food processing, lumber and wood products, machinery, chemical products, paper products, electronics manufacturing, silver and other mining, and tourism. The world's largest factory for barrel cheese, the raw product for processed cheese is located in Gooding, Idaho. It has a capacity of 120,000 metric tons per year of barrel cheese and belongs to the Glanbia group. The Idaho National Laboratory (INL), a government lab for nuclear energy research, is also an important part of the eastern Idaho economy. Idaho also is home to three facilities of Anheuser-Busch which provide a large part of the malt for breweries located across the nation.
Today, the largest industry in Idaho is the science and technology sector. It accounts for over 25% of the State's total revenue and 70%+ of the State's exports (in dollars). Idaho's industrial economy is growing, with high-tech products leading the way. Since the late 1970s, Boise has emerged as a center for semiconductor manufacturing. Boise is the home of Micron Technology Inc., the only U.S. manufacturer of dynamic random access memory (DRAM) chips. Hewlett-Packard has operated a large plant in Boise, in southwestern Idaho, since the 1970s, which is devoted primarily to LaserJet printers production.
Dell, Inc. operates a major customer support call center in Twin Falls. AMI Semiconductor, whose worldwide headquarter locates in Pocatello, is a widely recognized innovator in state-of-the-art integrated mixed-signal semiconductor products, mixed-signal foundry services and structured digital products. Coldwater Creek, a women's clothing retailer, is headquartered in Sandpoint.
The state personal income tax ranges from 1.6% to 7.8% in eight income brackets. Idahoans may apply for state tax credits for taxes paid to other states, as well as for donations to Idaho state educational entities and some nonprofit youth and rehabilitation facilities.
The state sales tax is 6%. Sales tax applies to the sale, rental or lease of tangible personal property and some services. Food is taxed, but prescription drugs are not. Hotel, motel, and campground accommodations are taxed at a higher rate (7% to 11%). Some jurisdictions impose local option sales tax.
Idaho has a state gambling lottery which contributed $333.5 million in payments to all Idaho public schools and Idaho higher education from 1990 - 2006.
Idaho is among the few states in the nation without a major freeway linking the two largest metropolitan areas of Boise in the south and Coeur d'Alene in the north. US-95 links the two ends of the state, but like many other highways in Idaho, is badly in need of repair and upgrade. In 2007, the Idaho Transportation Department stated that the state's highway infrastructure faces a $200 million per year shortfall in maintenance and upgrades. Interstate 84 is the main highway linking the Southeast and Southwest portions of the state, along with Interstate 86 and Interstate 15.
Major airports include the Boise Airport, and the Spokane International Airport, which serves northern Idaho. Other airports with scheduled service are the Pullman-Moscow Regional Airport serving the Palouse; the Lewiston-Nez Perce County Airport, serving the Lewis-Clark Valley and north central Idaho; The Magic Valley Regional Airport in Twin Falls; the Idaho Falls Regional Airport; and the Pocatello Regional Airport.
Idaho is served by two transcontinental railroads. The Burlington Northern Santa Fe (BNSF) connects North Idaho with Seattle, Portland and Spokane to the west, and Minneapolis and Chicago to the east. The BNSF travels through Kootenai, Bonner and Boundary Counties. The Union Pacific Railroad crosses southern Idaho travelling between Portland and Ogden, Utah and serves Boise, Nampa, Twin Falls, and Pocatello. Amtrak's Empire Builder crosses northern Idaho, with its only stop being in Sandpoint. There has been a push recently to return Amtrak service to southern Idaho as well.
The Port of Lewiston is the furthest inland Pacific port on the west coast. A series of dams and locks on the Snake River and Columbia River facilitate barge travel from here to Portland, where goods are loaded on ocean-going vessels.
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Since 1946 statewide elected constitutional officers have been elected to four-year terms. They include: Governor, Lieutenant Governor, Secretary of State, Controller (Auditor before 1994), Treasurer, Attorney General, and Superintendent of Public Instruction.
Last contested in 1966, Inspector of Mines was an original elected constitutional office. Afterwards it was an appointed position and ultimately done away with entirely in 1974.
Idaho's government has an alcohol monopoly.
Terms for both the Senate and House of Representatives are two years. Legislative elections occur every even numbered year.
The Idaho Legislature has been continuously controlled by the Republican Party since the late 1950s, although Democratic legislators are routinely elected from Boise, Pocatello, Blaine County and the northern Panhandle.
See also List of Idaho senators and representatives
| Year | Republican | Democratic |
|---|---|---|
| 2004 | 68.38% 409,235 | 30.26% 181,098 |
| 2000 | 67.17% 336,937 | 27.64% 138,637 |
| 1996 | 52.18% 256,595 | 33.65% 165,443 |
| 1992 | 42.03% 202,645 | 28.42% 137,013 |
| 1988 | 62.08% 253,881 | 36.01% 147,272 |
| 1984 | 72.36% 297,523 | 26.39% 108,510 |
| 1980 | 66.46% 290,699 | 25.19% 110,192 |
| 1976 | 59.88% 204,151 | 37.12% 126,549 |
| 1972 | 64.24% 199,384 | 26.04% 80,826 |
| 1968 | 56.79% 165,369 | 30.66% 89,273 |
| 1964 | 49.08% 143,557 | 50.92% 148,920 |
| 1960 | 53.78% 161,597 | 46.22% 138,853 |
After the Civil War, many Southern Democrats moved to Idaho Territory. As a result, the early territorial legislatures were solidly Democrat-controlled. In contrast, most of the territorial governors were appointed by Republican Presidents and were Republicans themselves. This led to sometimes bitter clashes between the two parties. In the 1880s, Republicans became more prominent in local politics.
Since statehood, the Republican Party has usually been the dominant party in Idaho, as there was a polar shift in social and political stance between the two parties, when the Democrats became more liberal and the Republicans more conservative. In the 1890s and early 1900s, the Populist Party enjoyed prominence while the Democratic Party maintained a brief dominance in the 1930s during the Great Depression. Since World War II, most statewide elected officials have been Republicans.
Idaho Congressional delegations have also been generally Republican since its statehood. Several Idaho Democrats have had electoral success in the House over the years, but the Senate delegation has been a Republican stronghold for decades. Several Idaho Republicans, including current Senators Larry Craig and Mike Crapo, have won reelection to the Senate, but only Frank Church has won reelection as a Democrat. Church was the last Idaho Democrat to win a U.S. Senate race in 1974. No Democrat has won a U.S. House race in Idaho since Larry LaRocco in 1992.
In modern times, Idaho has been a reliably Republican state in presidential politics as well. It has not supported a Democrat for president since 1964. Even in that election, Lyndon Johnson defeated Barry Goldwater by less than two percentage points. In 2004, George W. Bush carried Idaho by a margin of 38 percentage points and 68.4% of the vote, winning in 43 of 44 counties. Only Blaine County, which contains the Sun Valley ski resort, supported John Kerry, who owns a home in the area.
In the 2006 elections, Republicans led by Governor-elect C. L. "Butch" Otter won all of the state's constitutional offices and retained both of the state's seats in the United States House of Representatives. However, Democrats picked up several seats in the Idaho Legislature, notably in the Boise area.
Population > 50,000 (urbanized area)
Population > 30,000 (urbanized area)
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The Idaho State Board of Education oversees three comprehensive universities. The University of Idaho in Moscow was the first university in the state (founded in 1889). A land-grant institution, the UI is the state's flagship university. Idaho State University in Pocatello opened in 1901 as the Academy of Idaho and was granted university status in 1963. Boise State University is the most recent school to attain university status in Idaho. The school opened in 1932 as Boise Junior College and became Boise State University in 1974. Lewis-Clark State College in Lewiston is the only public, non-university 4 year college in Idaho.
Idaho has three regional community colleges: North Idaho College in Coeur d'Alene; College of Southern Idaho in Twin Falls; and The College of Western Idaho in Nampa, which is set to open in 2009.
Private institutions in Idaho are Brigham Young University-Idaho in Rexburg, which is affiliated with the Church of Jesus Christ of Latter-day Saints; The College of Idaho in Caldwell, which still maintains a loose affiliation with the Presbyterian Church; Northwest Nazarene University in Nampa; and New Saint Andrews College in Moscow, of reformed Christian theological background.
| Club | Sport | League |
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| Boise Hawks | Baseball | Minor League Baseball |
| Idaho Falls Chukars | Baseball | Minor League Baseball |
| Idaho Stampede | Basketball | NBA Development League |
| Boise Burn | Arena football | af2 |
| Idaho Steelheads | Ice hockey | East Coast Hockey League |
Boise is the host to the largest 5 K run for women, the St. Luke's Women's Fitness Celebration.