ORWA98_750UTM: Oregon/Washington 750 meter, 1926/1998 Bathymetry Grid; UTM Projection

ORWA98_750UTM is a digital bathymetric surface grid of the seafloor off the coast of Washington and Oregon. Grid cell spacing is 750m and the projection is UTM Zone 10. The surface grid was produced by merging National Ocean Service (NOS) Hydrographic Surveys conducted between 1926 and 1974 (primarily 1926 to 1930) with recent surveys conducted by the U.S. Army Corps of Engineers (USACE) in 1998 around the entrances to Grays Harbor, Willapa Bay, and the Columbia River. The results of this work represent the best available estimate of the seafloor morphology for the time period circa 1998. The user is cautioned, however, to use this data set with full knowledge of the original intent, the limitations, and assumptions used to generate it.