Lake Isabella

Lake Isabella also called Isabella Lake, is a reservoir in Kern County, California, United States created by the earthen Isabella Dam. At 11000 acres, it is one of the larger reservoirs in California. Lake Isabella is located about 40 mile northeast of Bakersfield, and is the main water supply for that city. It was formed in 1953 when the U.S. Army Corps of Engineers dammed the Kern River at the junction of its two forks. 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 2500 ft where summer temperatures reach over 100 °F but low enough to avoid winter snows on the surrounding ridges. The former towns of Isabella and Kernville were flooded when the reservoir was created.

Capacity
The U.S. Army Corps of Engineers operates and has jurisdiction over the main and auxiliary dams. In 2006, Isabella Dam was found to be too unstable to hold a full amount of water and approximately 37% of a full reservoir had to be let out to restabilize the earth works. The U.S. Army Corps of Engineers did not let the water get above 63% of capacity until an estimated 10–15 years of studies and repairs were made. The Isabella Dam bisects an active fault that could lead to a catastrophic failure if an earthquake occurs along it. This fault was considered inactive when the site was studied in the late 1940s. The project to retrofit the dam was substantially completed in 2022.

On February 3, 2023, the Army Corps of Engineers requested a deviation from the operating pool restriction of 361,000 acre.ft of water. If approved, Lake Isabella will be allowed to fill to its full capacity of 568,000 acre.ft for the first time in nearly 15 years.

Recreation
Kern County Parks maintains law enforcement and rescue responsibilities on the lake. Several recreation areas are located around the lake as a part of the Sequoia National Forest. The U.S. Forest Service oversees the majority of the land that touches the shore including boat ramps, campgrounds, roadways, and leases to private vendors providing services. The nearby towns of Lake Isabella and Kernville receive economic benefit from tourism created by the Lake Isabella Recreation Area and the whitewater rafting attraction of the Upper and Lower Kern River. Lake Isabella can be reached by car from Bakersfield via state Highway 178 and from Delano via Highway 155.