History
Geologists estimate that for 3 million years, at least through all the years of the Pleistocene glacial age, the Colorado River worked to build its delta in the southern region of the Imperial Valley. Eventually, the delta had reached the western shore of the Gulf of California (the Sea of Cortez/Cortés), creating a massive dam that excluded the Salton Sea from the northern reaches of the Gulf. Were it not for this dam, the entire Salton Sink along with the Imperial Valley, including most of the area occupied by Anza-Borrego Desert State Park, would all be submerged, as the Gulf would extend as far north as Indio.
As a result, the Salton Sink or Salton Basin has long been alternately a fresh water lake and a dry desert basin, depending on random river flows and the balance between inflow and evaporative loss. A lake would exist only when it was replenished by the river and rainfall, a cycle that repeated itself countless times over hundreds of thousands of years – most recently when the lake was recreated in 1905.
There is evidence that the basin was occupied periodically by multiple lakes. Wave-cut shorelines at various elevations are still preserved on the hillsides of the east and west margins of the present lake, the Salton Sea, showing that the basin was occupied intermittently as recently as a few hundred years ago. The last of the Pleistocene lakes to occupy the basin was Lake Cahuilla, also periodically identified on older maps as Lake LeConte, and the Blake Sea, after American professor and geologist William Phipps Blake.
Once part of a vast inland sea that covered a large area of Southern California, the endorheic Salton Sink was the site of a major salt mining operation. Throughout the Spanish period of California's history the area was referred to as the "Colorado Desert" after the Colorado River. In a railroad survey completed in 1855, it was called "the Valley of the Ancient Lake". On several old maps from the Library of Congress, it has been found labeled "Cahuilla Valley" (after the local Native American tribe) and "Cabazon Valley" (after a local Native American chief – Chief Cabazon). "Salt Creek" first appeared on a map in 1867 and "Salton Station" is on a railroad map from 1900, although this place had been there as a rail stop since the late 1870s.
Read more about this topic: Salton Sea
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