Tualatin River
| Tualatin River | |
|---|---|
Mouth of the Tualatin River | |
| 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 |
| 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 |
| • elevation | 1,978 ft (603 m) |
| 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 |
• elevation | 59 ft (18 m) |
| Length | 83 mi (134 km) |
| Basin size | 712 sq mi (1,840 km2) |
| Discharge | |
| • location | near West Linn, 1.8 miles (2.9 km) from the mouth |
| • average | 1,465 cu ft/s (41.5 m3/s) |
| • 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.