Alturas Lake is an alpine lake in Blaine County, Idaho, United States, in the Sawtooth Valley in the Sawtooth National Recreation Area.

Alturas Lake can be accessed from State Highway 75 via Sawtooth National Forest road 205.

[1] In the southern section of the Sawtooth Valley, Alturas Lake is the second largest lake in Sawtooth National Recreation Area and has easy access around its northern shore, several campgrounds, and private camps.

The lake took its name from the now-defunct Alturas County, Idaho.

This Blaine County, Idaho state location article is a stub.