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Algodón Slough is a seasonal slough that passes through Plumas Lake and flows into the Bear River. It is named for a former town called Algodón that was located just north of what is now Plumas Lake. Algodón Road is also named after the former town. The word algodón is Spanish for "cotton" and refers to cotton farms in the area.

Tributaries of Algodón Slough include Best Slough and Clark Slough.