Sly Park Dam is located near Placerville, California in the United States. The dam impounds Sly Park Creek, a tributary in the Cosumnes River watershed, to form a 41,000 acre foot (51,000 dam³), 650-acre (260 ha) reservoir called Jenkinson Lake. It was constructed as part of the American River Division of the Central Valley Project to provide irrigation water to a portion of El Dorado County, California.