Soda Lake Panorama, Carrizo Plain & the San Andreas Fault

Soda Lake is a shallow, ephemeral, alkali lake in the Carrizo Plain in southeastern San Luis Obispo County, California. The lake is at an elevation of 1,900 feet and covers an area of about 3,000 acres. Following exceptionally wet winters, typically El Niño years, the large northern and southern basins do not evaporate completely, although the water retreats toward the center of the basin leaving a salt crust up to 20 cm thick. Most of the large and small pans are fringed by clay dunes. It is one of the largest alkali wetlands remaining in natural condition in California. It supports fairy and brine shrimp, as well as migratory and nesting birds. A boardwalk was built along the shore to prevent damage to the saltbush habitat that borders the lake.

Alkali deposits at Soda Lake

Internal drainage of the Carrizo Plain and the formation of Soda Lake began during Pliocene-Pleistocene time when tectonic deformation associated with the San Andreas Fault defeated a stream that once drained the valley. An originally fresh to brackish water lake probably persisted through much of the Pleistocene during which coastal California was wetter and cooler than now. Diminished Holocene precipitation and a higher evaporation rate led to shrinkage of the ancestral lake and associated increased salinity which set the stage for clay dune formation.

*info from wikipedia.org