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Digital elevation models (DEMs) of the Elwha River delta, Washington, July 2018


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Stevens, A.W., Gelfenbaum, G.R., Warrick, J.A., Miller, I.M., and Weiner, H.M., 2022, Bathymetry, topography, and sediment grain-size data from the Elwha River delta, Washington, July 2018: U.S. Geological Survey data release,


This portion of the USGS data release presents digital elevation models (DEMs) derived from bathymetric and topographic surveys conducted on the Elwha River delta in July 2018 (USGS Field Activity Number 2018-648-FA). Nearshore bathymetry data were collected using two personal watercraft (PWCs) and a kayak equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS) receivers. Topographic data were collected on foot with survey-grade GNSS receivers mounted on backpacks. Positions of the survey platforms were referenced to a GNSS base station placed on a benchmark with known horizontal and vertical coordinates relative to the North American Datum of 1983 (CORS96 realization) and North American Vertical [...]


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ew18_dem_1m.asc 16.16 MB application/pgp-signature
ew18_dem_5m.asc 4.45 MB application/pgp-signature
“1-m resolution DEM color-coded to show elevation”
thumbnail 1.86 MB image/png
ew18_dem_5m.png thumbnail 934.54 KB image/png


Data were obtained to assess the coastal geomorphic response following the removal of two dams on the Elwha River. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify topographic and shallow-water bathymetric features.

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