Lava Flows, Lake Tahoe, Nevada

ID 2186

Lake Tahoe is situated in a graben between the fault-bounded Sierra Nevada and Carson Ranges. The Miocene-Pliocene lava flows, erupted in conjunction with the block faulting, built a natural dam across the northern drainage of the Truckee River and formed Lake Tahoe. Over 60 rivers drain into Lake Tahoe, although only the Truckee River flows out of the basin. Ultimately, the Truckee River flows eastward into Pyramid Lake, within the Great Basin. Photographed near Stateline Lookout, Lake Tahoe Basin Management Unit, Nevada.

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