The Calapooia River at its confluence with the Willamette River, Albany
|Etymology||For the Kalapuya people of the Willamette Valley|
|⁃ elevation||4,552 ft (1,387 m)|
|180 ft (55 m)|
|Length||80 mi (130 km)|
|Basin size||374 sq mi (970 km2)|
|⁃ average||898 cu ft/s (25.4 m3/s)|
The Calapooia flows generally northwest from its source in the Cascade Range near Tidbits Mountain. In its upper reaches, it passes through parts of the Willamette National Forest. Further downstream, it flows through Holley then Crawfordsville and Brownsville in the Willamette Valley before joining the Willamette at Albany. The city of Tangent is also near the river on a branch of one of its downstream tributaries, Lake Creek. The confluence of the two rivers is about 120 miles (190 km) by water from where the Willamette joins the Columbia River
Named tributaries of the river from source to mouth are Eighteen, Treadwell, and United States creeks followed by the North Fork Calapooia River. Then come King, Potts, Barrett/Hands, Washout, McKinley and Blue creeks. Further downstream are Biggs, Fox, Sweet Honey, Cedar, Pugh, Sawyer, Johnson, and Brush creeks. Finally come Warren, Cochrane, Courtney, Lake, and Oak creeks.
- "Calapooia River". Geographic Names Information System (GNIS). United States Geological Survey. November 28, 1980. Retrieved August 8, 2010.
- McArthur, Lewis A.; McArthur, Lewis L. (2003) . Oregon Geographic Names (7th ed.). Portland, Oregon: Oregon Historical Society Press. pp. 137–38. ISBN 0-87595-277-1.
- Source elevation derived from Google Earth search using GNIS source coordinates.
- Palmer, Tim (2014). Field Guide to Oregon Rivers. Corvallis: Oregon State University Press. pp. 175–76. ISBN 978-0-87071-627-0.
- "United States Topographic Map". United States Geological Survey. Retrieved January 28, 2016 – via ACME Mapper. The map includes mile markers along the Calapooia and Willamette rivers.
- Media related to Calapooia River at Wikimedia Commons
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