The Cosumnes River is a river in northern California in the United States. It rises on the western slope of the Sierra Nevada and flows approximately 52.5 miles into the Central Valley, emptying into the Mokelumne River in the Sacramento-San Joaquin Delta.
Country: United States
State: California
Cities: Plymouth, Rancho Murieta, Sloughhouse, Wilton, Elk Grove, Galt.