Three Island Lake

Three Island Lake is a small alpine lake in Boise County, Idaho, United States, located in the Sawtooth Mountains in the Sawtooth National Recreation Area. The lake is accessed from Sawtooth National Forest trail 462.

Three Island Lake is in the Sawtooth Wilderness, and a wilderness permit can be obtained at a registration box at trailheads or wilderness boundaries. Benedict Lake is downstream of Three Island Lake while Low Pass Lake is just over the pass to the southeast.