At 214 miles, what is the longest river entirely in Washington state, USA?

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At 214 miles, what is the longest river entirely in Washington state, USA?

Question #152518. Asked by serpa.
Last updated Aug 01 2026.
Originally posted Jul 22 2026 8:50 AM.

pehinhota

Answer has 3 votes

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pehinhota

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Answer has 3 votes.

Currently voted the best answer.

Located on the Columbia Plateau in Central Washington, the Yakima is the longest river entirely in Washington state, flowing 214 miles from Keechelus Lake to the Columbia River near West Richland.

https://www.yakimarivercanyon.com/

Jul 22 2026, 8:58 AM

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Answer 1

The longest river entirely in Washington state is the Yakima River.Named after the indigenous Yakama people, the river flows 214 miles from its headwaters at Keechelus Lake in the Cascade Range down to its confluence with the Columbia River near Richland.

At 214 miles, what is the longest river entirely in Washington state, USA?

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