Cosumnes River, Free-flowing river in northern California, United States
The Cosumnes River is a free-flowing waterway that originates in the Sierra Nevada mountains and winds through California's inland plains. The preserve encompasses oak forests, marshes, and grasslands that together create a mosaic of natural habitats.
The Miwok named this waterway after salmon, the fish that once filled its currents. Since the 1800s, the region transformed through settlement and farming, yet this river remains one of the few Sierra Nevada waterways still running free without dams.
The name reflects the Miwok heritage of people who settled along its banks centuries ago. Today, the riparian landscape serves as a refuge where visitors can observe how native plants and animals coexist in their natural state.
The preserve has several trails you can walk on your own or with a guide to learn about the landscape. Spring and fall offer the best conditions for visiting, with water visible and birds most active during these seasons.
Unlike nearly every other Sierra Nevada river, this waterway has no dams and runs according to its natural seasonal rhythm. This freedom allows periodic flooding that feeds the ecosystem and sustains the rare oak forests found here.
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