| Castle Lake is a glacial lake located in northern California along the eastern edge of the Klamath Mountains, in Siskiyou County, near the city of Mount Shasta. The outlet of the lake drains into Castle Lake Creek, and then into Lake Siskiyou; the lake is part of the headwaters of the Sacramento River. Nearly all of the lake's 47 acres are within the Shasta-Trinity National Forest. Trails lead from Castle Lake into the adjacent Castle Crags Wilderness area, and on to Castle Crags State Park, including trails to Little Castle Lake and Heart Lake. |
