Climate change around the end of the Pleistocene epoch led to a gradual dessication of ancient Lake Lahontan. Modern day remnants include Pyramid Lake, Walker Lake and Winnemucca Lake in Nevada, and Honey Lake in California. The ancient shoreline is evidenced by tufa formations throughout the region.
Modern Lake Lahontan is a man-made reservoir maintained by the Truckee-Carson Irrigation District (TCID). It is located between Fallon, Nevada and Carson City, Nevada. It is directly fed by the Carson River, and by diversions from the Truckee River.