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We characterized seafloor sediment conditions near the mouth of the Elwha River from underwater photographs taken every four hours from September 2011 to December 2013. A digital camera was affixed to a tripod that was deployed in approximately 10 meters of water (Tripod location from September 2011 to April 2013: 48.15333, -123.55931; tripod location from April 2013 to December 2013: 48.15407, -123.55444). Each photograph was qualitatively characterized as one of six categories: (1) base, or no sediment; (2) low sediment; (3) medium sediment; (4) high sediment; (5) turbid; or (6) kelp. For base conditions, no sediment was present on the seafloor. Low sediment conditions were characterized by a light dusting of...
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Data are time series of substrate grain size, remotely sensed water column turbidity, and measures of abundance (e.g., density, percent cover) of the nearshore subtidal (3-17 m depth) benthic community (vegetation, invertebrates, and fish) collected before (2008-2011) and during dam removal (2012-2014).
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Two dams on the Elwha River, Washington State, USA trapped over 20 million m3 of sediment, reducing downstream sediment fluxes and contributing to erosion of the river's coastal delta. The removal of the Elwha and Glines Canyon dams between 2011 and 2014 induced massive increases in river sediment supply and provided an unprecedented opportunity to examine the response of a delta system to changes in sediment supply. The U.S. Geological Survey (USGS) developed an integrated research program aimed at understanding the ecosystem responses following dam removal. The research program included repeated surveys of beach topography, nearshore bathymetry, and surface sediment grain size to quantify changes in delta morphology...
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This data release provides 15-minute data of suspended-sediment concentration and fine (less than 0.0625 mm) suspended-sediment concentration during the removal of 2 large dams on the Elwha River from September 2011 to September 2016. Data are derived from regression relations with turbidity at the USGS gaging station Elwha River at the Diversion (no.12046260).


map background search result map search result map Bathymetry and topography data from the Elwha River delta, Washington, May 2011 Characterization of seafloor photographs near the mouth of the Elwha River during the first two years of dam removal (2011-2013) USGS Topo Map Vector Data (Vector) 4661 Bodelteh Islands, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 4661 Bodelteh Islands, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 11622 Deadmans Hill, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 14235 Elwha, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 76267 Gardiner OE N, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 16820 Gardiner, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 21582 Hurricane Hill, Washington 20200711 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72407 Indian Pass, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 27303 Makah Bay, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 33811 Ozette, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 36803 Quillayute Prairie, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 40603 Sequim, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 40603 Sequim, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 41880 Snider Peak, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 46141 Twin Rivers, Washington 20200711 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 30888 Mount Walker, Washington 20200711 for 7.5 x 7.5 minute FileGDB 10.1 Data collected in 2008-2014 to assess nearshore subtidal community responses to increased sediment load during removal of the Elwha River dams, Washington State, USA Suspended sediment concentration data in the Elwha River, Washington, September 2011 to September 2016 Suspended sediment concentration data in the Elwha River, Washington, September 2011 to September 2016 USGS Topo Map Vector Data (Vector) 4661 Bodelteh Islands, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 4661 Bodelteh Islands, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 11622 Deadmans Hill, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 14235 Elwha, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 76267 Gardiner OE N, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 16820 Gardiner, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 21582 Hurricane Hill, Washington 20200711 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72407 Indian Pass, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 27303 Makah Bay, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 33811 Ozette, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 36803 Quillayute Prairie, Washington 20200711 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 40603 Sequim, Washington 20200710 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 40603 Sequim, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 41880 Snider Peak, Washington 20200710 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 46141 Twin Rivers, Washington 20200711 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 30888 Mount Walker, Washington 20200711 for 7.5 x 7.5 minute FileGDB 10.1 Data collected in 2008-2014 to assess nearshore subtidal community responses to increased sediment load during removal of the Elwha River dams, Washington State, USA