Cogswell Dam upstream and the Morris Dam greatly reduced the flood peak on the San Gabriel River, saving downstream cities millions of dollars' worth of damages. If it were not for the three dams, the flow past Azusa may have exceeded , but was limited to just , with Morris Dam alone reducing the flood peak by some . Morris Reservoir Naval Weapons Test Site Beginning in World War II, Morris Reservoir was used for the Morris Reservoir Naval Weapons Test Site for the U.S. Navy in conjunction with the California Institute of Technology. A wide variety of weapons, including torpedoes and ballistic missiles, had their trial runs here. Testing continued until the 1990s, when most of the structures at the associated military compound were demolished. However, the concrete foundations remain and are easily seen from State Route 39, which runs past the dam and reservoir. In 1995, MWD sold the dam to the Los Angeles County Department of Public Works, which continues to operate it and the reservoir today. See also Los Angeles County Department of Public Works dams List of reservoirs and dams in California References Notes External links Schematic of major reservoirs in the Los Angeles and San Gabriel River watersheds Historic American Engineering Record (HAER) documentation of test site, filed under CA State Highway 39 at Morris Reservoir, Azusa, Los Angeles County, CA: Los Angeles County Department of Public Works dams Gravity dams San Gabriel River (California) San Gabriel Mountains Angeles National Forest Azusa, California Dams completed in 1934 1934 establishments in California Historic American Engineering Record in California