The Big River is a tributary of the Coast Fork Willamette River, approximately 12 miles (19 km) long, in western Oregon in the United States.

[3] It rises in northern Douglas County, northwest of Huckleberry Mountain, approximately 20 miles (32 km) south-southeast of Cottage Grove at 43°32′25″N 122°53′52″W / 43.540398°N 122.897840°W / 43.540398; -122.897840 (Big River source).

It flows northwest through Lane County to form the Coast Fork of the Willamette at its confluence with the Little River, about 15 miles (24 km) south of Cottage Grove at 43°35′43″N 123°04′03″W / 43.5953987°N 123.0675727°W / 43.5953987; -123.0675727 (Garoutte Creek mouth)[1][3] Flowing northwest from the northern flanks of the Calapooya Mountains in Douglas County, Big River enters Lane County about 1 mile (1.6 km) downstream from the source.

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