Mushroom Lake is a small alpine lake in Custer County, Idaho, United States, located in the Sawtooth Mountains in the Sawtooth National Recreation Area. There are no trails leading to the lake, although it is most easily accessed from Sawtooth National Forest trail 092.Sawtooth National Forest. “Sawtooth National Forest” [map].1:126,720, 1”=2 miles. Twin Falls, Idaho: Sawtooth National Forest, United States Forest Service, 1998.
Mushroom Lake is in the Sawtooth Wilderness, and a wilderness permit can be obtained at a registration box at trailheads or wilderness boundaries. Hell Roaring Lake and Imogene Lake are downstream of Mushroom Lake.
See also List of lakes of the Sawtooth Mountains (Idaho) Sawtooth National Recreation Area
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