Lonesome Lake (Idaho)

Lonesome Lake is an alpine lake in Custer County, Idaho, United States, located in the White Cloud Mountains in the Sawtooth National Recreation Area. The lake is accessed from Sawtooth National Forest trail 683.

Lonesome Lake is northwest of Merriam Peak and located in the lower section of the Boulder Chain Lakes Basin. It is the highest elevation named lake in the Sawtooth National Recreation Area.