Tualatin River

Tualatin River
Mouth of the Tualatin River
Tualatin River is located in Oregon
Tualatin River
Location of the mouth of the Tualatin River in Oregon
EtymologyProbably 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
CountryUnited States
StateOregon
CountyWashington, Clackamas
Physical characteristics
SourceNorthern Oregon Coast Range
 • locationnear Windy Point, Tillamook State Forest, Washington County, Oregon
 • coordinates45°28′55″N 123°24′21″W / 45.48194°N 123.40583°W / 45.48194; -123.40583[1]
 • elevation1,978 ft (603 m)[3]
MouthWillamette 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)
Length83 mi (134 km)[4]
Basin size712 sq mi (1,840 km2)[4]
Discharge 
 • locationnear West Linn, 1.8 miles (2.9 km) from the mouth[5]
 • average1,465 cu ft/s (41.5 m3/s)[5]
 • minimum0.20 cu ft/s (0.0057 m3/s)
 • maximum26,400 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]

  1. ^ a b "Tualatin River". Geographic Names Information System (GNIS). United States Geological Survey. November 28, 1980. Retrieved July 6, 2009.
  2. ^ McArthur, Lewis A.; McArthur, Lewis L. (2003). Oregon Geographic Names (Seventh ed.). Portland, Oregon: Oregon Historical Society Press. p. 971. ISBN 0-87595-277-1.
  3. ^ Google Earth elevation for GNIS coordinates
  4. ^ a b Tualatin River Watershed Council. "Frequently Asked Questions". Tualatin River Watershed Council. Archived from the original on July 17, 2012. Retrieved July 9, 2009.
  5. ^ a b "Water-data report 2008: 14207500 Tualatin River at West Linn, OR" (PDF). United States Geological Survey. Retrieved July 6, 2009.
  6. ^ "Tualatin Basin Information". Tualatin River Watershed Council. Archived from the original on July 2, 2009. Retrieved July 7, 2009.