The last free flowing western Sierra River, the Cosumnes is situated between the American River basin to the north and the Mokelumne River basin to the south. The river flows in a west-southwest direction for over 80 miles, eventually reaching the Delta via its confluence with the Mokelumne River.
The Cosumnes Watershed is rich in ecological values and productive agricultural lands, worthy of preservation. Highlights include:
Uniquely wild and scenic, with Intact geomorphology and winter hydrograph, the Cosumnes offers rare opportunities for restoration and preservation.
Cosumnes is a Miwok word, cos=salmon, umne=people, or "salmon people". The Miwok people have traveled and lived throughout the Cosumnes River watershed for thousands of years.