Duwamish River
The Duwamish River is the name of the lower 12 miles of Washington state's Green River. Its industrialized estuary is known as the Duwamish Waterway. At one time, the Black River and the White and Green Rivers, which combined at Auburn, joined at Tukwila to form the Duwamish; however, in 1912 the Cedar River was diverted to empty into Lake Washington instead of the Black River, though the lake itself still emptied into the Black. Then, with the opening of the Lake Washington Ship Canal in 1916, the lake's level dropped nearly nine feet and the Black River dried up. Hence the point of the name change is no longer the confluence of the Green and Black rivers, though it has not changed location.The Duwamish Waterway empties into Elliott Bay in Seattle, divided by the man-made Harbor Island into two channels, the East and West Waterways.