Walla Walla River

For other uses, see Walla Walla (disambiguation).
Walla Walla River
Confluence of the Walla Walla and the Columbia rivers.
Walla Walla River is located in Washington (state)
Walla Walla River
Mouth of the Walla Walla River in Washington
Location
CountryUnited States
StateWashington
Physical characteristics
SourceBlue Mountains
 • locationnear Milton–Freewater
 • coordinates45°53′54″N 118°18′28″W / 45.89833°N 118.30778°W / 45.89833; -118.30778[1]
MouthColumbia River at Lake Wallula
 • location
Wallula
 • coordinates
46°3′58″N 118°55′3″W / 46.06611°N 118.91750°W / 46.06611; -118.91750[1]
Length61 mi (98 km)
Basin size1,758 sq mi (4,550 km2)[2]
Discharge 
 • locationWalla Walla
 • average589 cu ft/s (16.7 m3/s)[3]
 • maximum33,400 cu ft/s (950 m3/s)[3]

The Walla Walla River is a tributary of the Columbia River, joining the Columbia just above Wallula Gap in southeastern Washington in the United States. The river flows through Umatilla County, Oregon, and Walla Walla County, Washington.[1] Its drainage basin is 1,758 square miles (4,550 km2) in area.[2]

  1. ^ a b c U.S. Geological Survey Geographic Names Information System: Walla Walla River
  2. ^ a b Walla Walla Subbasin Plan Archived 2012-02-13 at the Wayback Machine, Northwest Power and Conservation Council
  3. ^ a b Cite error: The named reference wdr was invoked but never defined (see the help page).