Coast Fork Willamette

The Coast Fork Willamette River is one of two forks that unite to form the Willamette River in western Oregon in the United States. It is about 40 miles (64 km) long, draining an area of the mountains at the south end of the Willamette Valley south of Eugene.

Source: Wikipedia https://en.wikipedia.org/wiki/Coast_Fork_Willamette_River