Surprise Lake is a small alpine lake in Elmore County, Idaho, United States, located in the Sawtooth Mountains in the Sawtooth National Recreation Area. The lake is accessed from Sawtooth National Forest trail 479 along Timpa Creek Creek.Sawtooth National Forest. “Sawtooth National Forest” ap1:126,720, 1”=2 miles. Twin Falls, Idaho: Sawtooth National Forest, United States Forest Service, 1998. Surprise Lake is in the Sawtooth Wilderness, and a wilderness permit can be obtained at a registration box at trailheads or wilderness boundaries. Timpa Lake is downstream of Surprise Lake, while Chickadee Lake is upstream to the southwest and Confusion Lake is upstream to the northeast.

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