Mad River (Washington)

Mad River
Location of the mouth of the Mad River in Washington
Mad River (Washington) (the United States)
Location
CountryUnited States
StateWashington
CountyChelan
Physical characteristics
SourceCascade Range
  coordinates47°56′30″N 120°38′52″W / 47.94167°N 120.64778°W / 47.94167; -120.64778
MouthEntiat River
  coordinates
47°44′9″N 120°21′48″W / 47.73583°N 120.36333°W / 47.73583; -120.36333
Basin size92.4 sq mi (239 km2)
Discharge 
  locationriver mile 0.4 at Ardenvoir
  average76.7 cu ft/s (2.17 m3/s)
  minimum9.0 cu ft/s (0.25 m3/s)
  maximum659 cu ft/s (18.7 m3/s)

The Mad River is a river in the U.S. state of Washington. It rises in the Cascade Mountains and flows southeast to join the Entiat River. It is part of the Columbia River basin, being a tributary of the Entiat River, which empties into the Columbia River.