Crowley Lake is a reservoir on the upper Owens River in southern Mono County, California in the United States. It was created in 1941 by the Los Angeles Department of Water and Power (DWP) as storage for the Los Angeles Aqueduct and for flood control. Also known for its trout fishing: between 6,000 and 10,000 anglers hit the lake on opening day; largest brown trout taken from the lake weighed 27 pounds (12 kg). White Mountains in background. Inyo County, CA.