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Which major rivers flow into the Columbia River?
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Columbia River
Columbia River Gorge, Oregon-Washington border.
The Columbia River is fed by several major tributaries that contribute to its significant drainage basin. The primary rivers that flow into the Columbia include:
- Kootenay River
- Snake River (the largest tributary)
- Pend Oreille River
- Spokane River
- Okanogan River
- Yakima River
- Cowlitz River
- Willamette River1
The Snake River, which joins the Columbia just south of Pasco, Washington, is the most significant of these, draining a vast area across several states in the Pacific Northwest.12