Bass Lake (Marin County, California)
| Bass Lake | |
|---|---|
| Location | Marin County, California |
| Coordinates | 37°57′01″N 122°46′31″W / 37.95028°N 122.77528°WCoordinates: 37°57′01″N 122°46′31″W / 37.95028°N 122.77528°W |
| Type | slightly saline slightly alkaline slightly eutrophic warm monomictic |
| Primary inflows | streams on north and east shores |
| Primary outflows | via creek to Pacific Ocean |
| Catchment area | 66 hectares (163 acres) |
| Basin countries | United States |
| Surface area | 3 hectares (7.4 acres) |
| Average depth | 17.5 metres (57.4 ft) |
| Water volume | 400 thousand cubic metres (320 acre·ft) |
| Surface elevation | 374 feet (114 m) |
Bass Lake is a small lake in the southern portion of the Point Reyes National Seashore, northwest of Bolinas. The lake sits at an elevation of 374 feet (114 m) and flows out south to the ocean via a 1-mile (1.6 km) creek. Bass Lake is the largest of the five Coast Trail Lakes, which also include Pelican Lake, Crystal Lake, Ocean Lake and Wildcat Lake.
As with the other nearby lakes in the southeast portion of the Point Reyes peninsula, Bass Lake occupies a natural synclinal depression formed behind blocks of rock displaced by landslides within the past 10,000 years. The depressions forming Crystal, Pelican and Bass lakes appear to have been caused by the Double Point Slide, which covers an area of about 1.7 square miles (4.4 km2). The rocks involved in the landslide are shale, chert and sandstone, some similar to Miocene rocks of the Monterey Formation and others to Pliocene rocks from the Central Coast Ranges. The process that caused these slides is ongoing, with several nearby slides caused by the 1906 San Francisco earthquake and others as recently as 1956.
The lake is within the Southern Inverness Ridge region of the Point Reyes National Seashore, in an area of coastal scrub and grassland. In this coastal zone there are open stands of coyote brush (Baccharis pilularis), often with native grasses such as California oatgrass (Danthonia californica) and purple needlegrass (Nassella pulchra). The other dominant plants in this ecosystem are California sage brush (Artemisia californica), black sage (Salvia mellifera), sticky monkeyflower (Mimulus guttatus), poison oak (Toxicodendron diversilobum), California coffeeberry (Frangula californica) and tree lupine (Lupinus arboreus).
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