Hidden Dam is an earthen dam on the Fresno River in Madera County, California. It creates a reservoir known as Lake Hensley.
The dam was constructed in 1974 by the Perini Corporation as part of an expansive United States Army Corps of Engineers project for flood control, irrigation storage, and recreation. The dam is 184 feet tall, is 5730 feet long at its crest, and is the only major storage dam of the Fresno River.
The reservoir it creates, Lake Hensley, has a water surface of two and a half square miles, over twenty miles of shoreline, and has a maximum storage capacity of 90,000 acre-feet. In 1978 the lake was opened to day-use recreation, including water skiing, fishing, swimming, horseback riding, mountain biking, and hiking. The area also hosts the state Hensley Lake Recreation Area.
The lake is named for local settler and cattle rancher John Jackson Hensley.
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