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Sediment grain size from the Elwha River, Washington, 2006 to 2017


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East, A.E., Logan, J.B., and Mastin, M.C., 2018, River-channel topography and sediment grain size on the Elwha River, Washington, 2006 to 2017: U.S. Geological Survey data release,


The grain size of sediment on the riverbed was measured during 20 surveys on the Elwha River, Washington, between 2006 and 2017. Most data were collected along the same transects where channel topography was measured (see related child item in this data release: Measurements of sediment ranging from medium sand to boulders were made using the CobbleCam digital photographic technique (Warrick and others, 2009), which uses a calibrated autocorrelation algorithm (Rubin, 2004) to calculate the mean grain size of sediment from pixels in downward-looking digital photographs. This technique yields grain-size values accurate to within 14 percent of those obtained by pebble [...]


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GrainSizes_ElwhaRiver_2006to2017.csv 471.04 KB
“Image map showing locations of study reaches and transects along the Elwha River”
thumbnail 802.04 KB


Data were collected to study sediment in the Elwha River before and after the removal of the Glines Canyon and Elwha dams.

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