Lake Isabella (also called Isabella Lake ) is a reservoir in Kern County, California created by the earthen Isabella Dam. It was formed in 1953 when the U.S. Army Corps of Engineers dammed the Kern River at the junction of its two forks at Whiskey Flat. At 11,000 acres (4,500 ha), it is one of the larger reservoirs in California. The area is in the southern end of the Sierra Nevada range and the lake itself is located in low mountains at an elevation of approximately 2,500 ft (760 m) where summer temperatures reach over 100 degrees (°F) but low enough to avoid winter snows on the surrounding ridges. Lake Isabella is located about 40 mi. northeast of Bakersfield, and is the main water supply for that city.