Niawiakum River
General data
- Name: Niawiakum River
- Water system: Pacific Ocean
- Water type: River
- Progression: Willapa Bay -> Pacific Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
The Niawiakum River is a short river in the U.S. state of Washington. It is approximately 6 miles (9.7 km) long.
Course The Niawiakum River originates in the hills of the southwestern part of Washington. It flows generally west, emptying into Willapa Bay near Bay Center and the mouth of the Palix River. The river's entire length is only a few miles.
The lower half of the Niawiakum River is a broad estuary and tidal marshland.
U.S. Route 101 crosses the river near its mouth.