Rock Island Lake is a small

alpine lake Alpine lakes are classified as lakes at high altitudes in mountainous zones, usually near or above the tree line, with extended periods of ice cover. These lakes are commonly formed from glacial activity (either current or in the past) but can al ...

in Elmore County,

Idaho Idaho ( ) is a state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Montana and Wyom ...

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

, located in the Sawtooth Mountains in the

Sawtooth National Recreation Area The Sawtooth National Recreation Area (SNRA) is a national recreation area in central Idaho, United States that is managed as part of Sawtooth National Forest. The recreation area, established on August 22, 1972, is managed by the U.S. Forest Ser ...

. The lake is accessed from

Sawtooth National Forest Sawtooth National Forest is a United States National Forest, National Forest that covers 2,110,408 acres (854,052 ha) in the U.S. states of Idaho (~96 percent) and Utah (~4 percent). Managed by the U.S. Forest Service in the United States Depart ...

trail 459 along Johnson Creek.Sawtooth National Forest. “Sawtooth National Forest” ap1:126,720, 1”=2 miles. Twin Falls, Idaho: Sawtooth National Forest, United States Forest Service, 1998. Rock Island Lake is in the

Sawtooth Wilderness The Sawtooth Wilderness is a federally-protected wilderness area that covers of the state of Idaho. Managed by the U.S. Forest Service in the U.S. Department of Agriculture, it was designated the Sawtooth Primitive Area in 1937 to preserve the ...

, and a wilderness permit can be obtained at a registration box at trailheads or wilderness boundaries. There is a single rocky island that is less than long that gives the lake its name.

References

See also