Sawtooth Lake is an alpine lake in Custer County, Idaho, United States, located high in the Sawtooth Mountains in the Sawtooth National Recreation Area. The lake is approximately 6.8 miles southwest of Stanley. A trail from the Iron Creek trailhead and campground leads approximately 5 miles to Sawtooth Lake. The Iron Creek trailhead ca…Sawtooth Lake is an alpine lake in Custer County, Idaho, United States, located high in the Sawtooth Mountains in the Sawtooth National Recreation Area. The lake is approximately 6.8 miles southwest of Stanley. A trail from the Iron Creek trailhead and campground leads approximately 5 miles to Sawtooth Lake. The Iron Creek trailhead can be accessed from State Highway 21 via Sawtooth National Forest road 619.