Chehalis River (Washington)

Chehalis River
Chehalis River Valley (left), Grays Harbor (middle distance) and Satsop River Valley (along bottom)
Map of the Chehalis River watershed
Mouth of the Chehalis River in Washington Show map of Washington (state) Chehalis River (Washington) (the United States) Show map of the United States
Location
Country	United States
State	Washington
Counties	Grays Harbor, Lewis, Mason, Thurston
Cities	Aberdeen, Centralia, Chehalis
Physical characteristics
Source
• location	Lewis County
• coordinates	46°27′6″N 123°17′30″W / 46.45167°N 123.29167°W / 46.45167; -123.29167[1]
• elevation	1,000 ft (300 m)[2]
Mouth	Pacific Ocean
• location	Grays Harbor, Aberdeen
• coordinates	46°57′29″N 123°50′5″W / 46.95806°N 123.83472°W / 46.95806; -123.83472[1]
• elevation	0 ft (0 m)[2]
Length	115 mi (185 km)[3]
Basin size	2,660 sq mi (6,900 km2)[4]
Discharge
• location	near Satsop, WA[5]
• average	6,425 cu ft/s (181.9 m3/s)[5]
• minimum	440 cu ft/s (12 m3/s)
• maximum	47,000 cu ft/s (1,300 m3/s)
Discharge
• location	mouth (Grays Harbor)[4]
• average	11,208 cu ft/s (317.4 m3/s)[4]
Basin features
Tributaries
• right	South Fork Chehalis River, Newaukum River, Skookumchuck River, Satsop River, Wynoochee River, Wishkah River

The Chehalis River (/ʃəˈheɪlɪs/ ^ⓘ shə-HAY-liss)^[6] is a river in Washington in the United States. It originates in several forks in southwestern Washington, flows east, then north, then west, in a large curve, before emptying into Grays Harbor, an estuary of the Pacific Ocean. The river is the largest solely contained drainage basin in the state.