Island Park Dam is operated by the U.S. Bureau of Reclamation in Fremont County, Idaho

Fremont County, Idaho

Fremont County is a county located in the U.S. state of Idaho. The county was established in 1893, and was named for the explorer John C. Frémont. As of the 2000 census the county had a population of 11,819 . The county seat and largest city is St. Anthony...

. The dam lies in Targhee National Forest near Island Park

Island Park, Idaho

Island Park is a city in Fremont County, Idaho, United States. The city's population was 215 at the 2000 census. The city was incorporated by owners of the many lodges and resorts along U.S. Route 20 in 1947, primarily to circumvent Idaho's liquor laws that prohibited the sale of liquor outside of...

. The zoned earthfill dam was built between 1937 and 1939 as part of the Minidoka Project

Minidoka Project

The Minidoka Project is a series of public works by the U.S. Bureau of Reclamation to control the flow of the Snake River in Wyoming and Idaho, supplying irrigation water to farmlands in Idaho...

, which provides water to irrigate farmland in Idaho

Idaho

Idaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....

's Snake River Plain

Snake River Plain

The Snake River Plain is a geologic feature located primarily within the state of Idaho in the United States of America. It stretches about westward from northwest of the state of Wyoming to the Idaho-Oregon border. The plain is a wide flat bow-shaped depression, and covers about a quarter of Idaho...

.

The dam provides only water storage, impounding 135000 acre.ft, which is distributed by the Cross Cut Canal to farms in Fremont and Madison

Madison County, Idaho

Madison County is a county located in the U.S. state of Idaho. As of the 2000 Census the county had a population of 27,467 . The county seat and largest city is Rexburg. Madison County is part of the Rexburg, ID, Micropolitan Statistical Area.- History :The area was originally settled by members...

 counties in Idaho, and Teton County

Teton County, Wyoming

Teton County is a county located in the U.S. state of Wyoming. As of 2010, the population was 21,294. Its county seat is Jackson. Teton County contains the affluent Jackson Hole skiing area...

 in Wyoming. The Island Park and Grassy Lake

Grassy Lake Dam

Grassy Lake Dam is a small dam operated by the U.S. Bureau of Reclamation in Teton County, Wyoming, immediately to the south of Yellowstone National Park. The dam lies in a corridor of Bridger-Teton National Forest that runs between Yellowstone and Grand Teton National Parks. The dam structure and...

 reservoirs were built as an alternative to construction of a larger project that would have flooded the Falls River area of Yellowstone National Park

Yellowstone National Park

Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho...

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External links

• Island Park Dam at the Bureau of Reclamation