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Map Satellite These cognate lakes, which were formed by the same landslide that reversed the drainage of Clear Lake, are of interest biologically as a result of their dissimilarity.
Both of the lakes are narrow, being at the widest some 200 meters (650 feet); however, they differ considerably in depth. The upper lake, which is approximately 2 kilometers (1.2 miles) long, reaches a depth of over 55 meters (180 feet). The lower lake, about 1 kilometer (0.6 mile) long, is considerably shallower, reaching a depth of about 8 meters (25 feet). The upper lake has a marked thermo-cline which is absent in the lower lake. The latter is eutrophic, and there are marked differences in the zooplankton of the two lakes.
A number of migratory waterfowl are found on the lakes in season. The endangered bald eagle, Haliaeetus leucocephalus, has been sighted here.
The highest portion of the landslide is northwest of Upper Blue Lake and marks the divide between the Russian River and Cache Creek (Sacramento River) drainages in this area.
Integrity: There are a number of resorts and cabins along the shores of the lakes and they receive moderately heavy recreational use. Various fish are introduced.
Use: Research, educational, observational, present recreation.
January 1977
Inventory of California Natural Areas
Revision © 2008 Steven Louis Hartman
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