The Downie River is an approximately 5.5 mi (8.9 km) tributary of the North Yuba River in Sierra County, California, in the United States.
The river originates from the confluence of the West Branch Downie River and Rattlesnake Creek in the Tahoe National Forest, and flows south to its confluence with the North Yuba at Downieville.
The river drains a mountainous watershed of about 34 sq mi (88 km2) in the northern Sierra Nevada.
The river and town are named after Scottish prospector William Downie, who settled here in 1850.
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