Cultus Lake is a natural lake in Deschutes County in the U.S. state of Oregon. Formed by a glacier, it is located in the high Cascade Range in the Deschutes National Forest. The name is from the Chinook Jargon and means variously bad or worthless, or simply "in vain". In the early 19th century, the lakes in this area abounded with beavers. The earliest explorers to this area were primarily on a quest for furs. 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 2 miles (3.2 km) long. I got up nice and early and walked to the end of their dock area to get this image. That is the South Sister in the background, I think.