Oregon Watershed
Lower Columbia Tributaries
The lower Columbia River flows 146 miles from Bonneville Dam to the Pacific Ocean. It is arguably the most important reach of the entire Columbia River, nurturing fish and wildlife in the transition from fresh water to salt water, passing through major cities and towns, flowing through wildlife refuges, supporting ports and a shipping channel, and providing valued recreation opportunities.
- Bull Trout
- Chum Salmon
- Coastal Cutthroat Trout
- Coho Salmon
- Fall Chinook
- Pink Salmon
- Resident Rainbow Trout
- Sockeye Salmon
- Spring Chinook Salmon
- Summer Steelhead
- Winter Steelhead
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Watershed Report Card
Good
Overall health score: 78/100
Data sources: USGS NWIS, EPA ATTAINS, StreamNet, NIFC, US Drought Monitor, NID. Scoring methodology developed by Native Fish Society based on salmonid habitat criteria. Data reviewed 2026.
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