Clear Lake State Park The Clear Lake area has a rich and interesting Native American and early settler?s history. Several thousand years ago, a landslide blocked natural drainage from a valley into the Russian River. The water rose until it found an outlet through Cache Creek into the Sacramento River to form Clear Lake, the largest natural lake entirely within California.
Clear Lake State Park Interpretive Association:
Frinds of Clear Lake State Park The Dorn Trail -- Guided interpretive hikes are given on the 2.5-mile Dorn nature trail, which illustrates occurrences during the historical Indian settlement of the area and the natural features that occur today throughout the area.