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National Preserve: Mojave Preserve

Soda Lake Playa

Playa lakes are among the flattest landforms in the world. They form under arid conditions in interior basins with no outlet to the sea. During wetter climatic conditions, the playa lake basins of the Basin-and-Range province were filled with perennial lakes.

Soda Lake lies at the terminus of the Mojave River. In wet years, the playa may contain standing water and flooding has occurred near the highway at Baker. In drier times, water lies very near the surface in parts of the playa. Capillary action draws the water upward where it evaporates, leaving a puffy “efflorescent” crust of evaporite minerals such as sodium carbonate and sodium bicarbonate.

At least twice, a long-lived lake (Lake Mojave I and II) existed in the region of Soda and Silver Lake playas, from about 18,000 to 16,000 years ago and from 13,700 to 11,400 years ago. The second lake developed when Afton Canyon was incised and a large lake near Barstow (Lake Manix) was drained.

Lake Mojave dried out by about 8,700 years ago. Although short-lived, lakes have periodically existed in the basin. Desiccated lakes can be major sources of eolian sediments, as the man-made desiccation of Owens Lake has shown recently. Thus, the complex history of Soda Lake is interwoven with the history of the dune fields at its southern margin.



Also see:

Geology:
Land Formation & Erosional Processes
Playa/Dry Lake Formation

Mojave Preserve Geology



Sunrise at Soda Lake


Looking southeast across Soda Lake


Evaporite crust of Soda Lake

Mojave Geomorphic Province
Mojave Desert Ecosection
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