Cultus Lake is a lake in Deschutes County, Oregon. Formed by a glacier, it is located in the high Cascade Range in the Deschutes National Forest. Cultus Lake lies at the base of the Cultus Mountain. The lake itself is natural and is 211 feet (64 m) at its deepest point and about two miles long. Two species of fish inhabit the lake: rainbow trout and mackinaw usually caught with flatfish or anything shiny like a minnow.