Course
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. Box Canyon enters from the right at about river mile (RM) 9 or river kilometer (RK) 14. Big River receives Boulder Creek from the left, then Edwards Creek enters from the right at about RM 6 (RK 10). After receiving Bar Creek from the left and Martin Creek from the right, Big River meets Garoutte Creek to form the Coast Fork Willamette River about 40 miles (64 km) from where the larger stream meets the Middle Fork Willamette River to form the Willamette River.
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