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Bathymetric Data in the Green River near Tukwila, Washington

October 20, 2017

The U.S. Army Corps of Engineers scheduled repair on parts of an 850-ft long levee located along the Green River near S. 180th St. and Highway 181 downstream of Kent, WA. There is a Muckleshoot Indian Tribe Usual and Accustomed treaty area fishing site immediately downstream from the proposed bank work area and the Tribe is concerned that the levee rehabilitation project may cause changes to this fishing site.
The U.S. Geological Survey (USGS) was contracted to measure and document river channel bathymetry at the Muckleshoot Indian Tribe fishing site in the immediate vicinity of the levee repair project. We made four site visits, one immediately before levee repair work on 7/30/2015, and three after the levee work on 1/21/2016 and 5/12/2016, during a relatively high flow winter/spring and on 9/27/2016 approximately one year after the levee work has been completed.
The USGS used an Acoustic Doppler Current Profiler (ADCP) to measure the bathymetry and velocity profiles along multiple cross sections spanning the Muckleshoot Indian Tribe fishing site of interest. Specific cross-section locations were selected in consultation with the U.S. Army Corps of Engineers and the Tribe.
The USGS processed, quality assured, and delivered four bathymetry data packages electronically to the U.S. Army Corps of Engineers.