Coast Fork Willamette River
The Coast Fork Willamette River
Map of the Willamette River basin with the Coast Fork highlighted
Location of the mouth of the Coast Fork Willamette River in Oregon
Etymology	Willamette is from a similar Clackamas Indian village name[2]
Location
Country	United States
State	Oregon
County	Lane
Physical characteristics
Source	Confluence of Big River and Garoutte Creek
• location	Calapooya Mountains, Oregon
• coordinates	43°35′44″N 123°4′4″W / 43.59556°N 123.06778°W / 43.59556; -123.06778[1]
• elevation	990 ft (300 m)[3]
Mouth	Willamette River
• location	near Eugene and Springfield, Oregon
• coordinates	44°1′23″N 123°1′25″W / 44.02306°N 123.02361°W / 44.02306; -123.02361[1]
• elevation	436 ft (133 m)[1]
Length	40 mi (64 km)[4]
Basin size	666 sq mi (1,720 km2)[5]
Discharge
• location	Goshen, 6.4 miles (10.3 km) from the mouth[6]
• average	1,558 cu ft/s (44.1 m3/s)[7]
• minimum	36 cu ft/s (1.0 m3/s)
• maximum	58,500 cu ft/s (1,660 m3/s)
Basin features
Tributaries
• right	Row River

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.

Course

The Coast Fork Willamette River is formed in southwestern Lane County, in the Calapooya Mountains, by the confluence of the Little River and the Big River. The Coast Fork flows north through the mountains, through the Cottage Grove Lake reservoir, to Cottage Grove, where it receives the Row River from the southeast. It continues north past Creswell and joins the Middle Fork from the south, about 2 miles (3 km) southeast of Eugene, to form the Willamette.