Tualatin River

Tualatin River
Mouth of the Tualatin River
Location of the mouth of the Tualatin River in Oregon
Etymology	Probably an Indian word meaning "lazy" or "sluggish" but possibly meaning "treeless plain" for the plain near the river or "forked" for its many tributaries[2]
Location
Country	United States
State	Oregon
County	Washington, Clackamas
Physical characteristics
Source	Northern Oregon Coast Range
• location	near Windy Point, Tillamook State Forest, Washington County, Oregon
• coordinates	45°28′55″N 123°24′21″W / 45.48194°N 123.40583°W / 45.48194; -123.40583[1]
• elevation	1,978 ft (603 m)[3]
Mouth	Willamette River
• location	near West Linn, Clackamas County, Oregon
• coordinates	45°20′17″N 122°39′05″W / 45.33806°N 122.65139°W / 45.33806; -122.65139[1]
• elevation	59 ft (18 m)
Length	83 mi (134 km)[4]
Basin size	712 sq mi (1,840 km2)[4]
Discharge
• location	near West Linn, 1.8 miles (2.9 km) from the mouth[5]
• average	1,465 cu ft/s (41.5 m3/s)[5]
• minimum	0.20 cu ft/s (0.0057 m3/s)
• maximum	26,400 cu ft/s (750 m3/s)

The Tualatin River is a tributary of the Willamette River in Oregon in the United States. The river is about 83 miles (134 km) long, and it drains a fertile farming region called the Tualatin Valley southwest and west of Portland at the northwest corner of the Willamette Valley. There are approximately 500,000 people residing on 15 percent of the land in the river's watershed.^[6]