Willapa River
Location of the mouth of the Willapa River in Washington
Location
Country	United States
State	Washington
County	Pacific
Physical characteristics
Source	Willapa Hills
• location	Washington
• coordinates	46°29′50″N 123°24′47″W / 46.49722°N 123.41306°W / 46.49722; -123.41306[1]
Mouth	Willapa Bay
• location	Washington
• coordinates	46°42′27″N 123°51′2″W / 46.70750°N 123.85056°W / 46.70750; -123.85056[1]
• elevation	0 ft (0 m)[1]
Length	20 mi (32 km)
Discharge
• location	river mile 17.8, near Willapa, WA[2]
• average	636 cu ft/s (18.0 m3/s)[2]
• minimum	14 cu ft/s (0.40 m3/s)
• maximum	12,800 cu ft/s (360 m3/s)

The Willapa River is a river on the Pacific coast of southwestern Washington in the United States, approximately 20 miles (32 km) long. It drains an area of low hills and a coastal plain into Willapa Bay, a large estuary north of the mouth of the Columbia River.

The river rises in the Willapa Hills in southeastern Pacific County, approximately 25 miles (40 km) west of Chehalis. It flows northwest in a winding course past the small communities of Willapa and Raymond. It enters the northwest end of Willapa Bay at South Bend.

Name

The name is that of the Willapa people, an Athapaskan-speaking people, now extinct, who occupied the valley of the river and also the prairies between the headwaters of the Chehalis and Cowlitz Rivers.^[3]