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The 2010 Lower Columbia Terrain Model is a combined bathymetric/topographic seamless digital elevation model created by the Portland District of the US Army Corps of Engineers. The project was completed primarily to support hydraulic modeling related to the Columbia River Treaty, however its applications extend far beyond this. The model includes recent elevation data available for the lower Columbia River and its floodplain, including the following sources: NOAA multibeam bathymetric surveys, 2008-2009 US Army Corps of Engineers crossline and channel bathymetric surveys, 2000 - 2009 Estuary