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Black River (Duwamish River) on:  
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![Duwamishvalley1899-1959](https://upload.wikimedia.org/wikipedia/commons/4/4b/Duwamishvalley1899-1959.png)
The Black River is a
tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage ...
of the