2011 Elwha River Benthic Survey in the Strait of Juan de Fuca RAW VIDEO F2Z 90 Degrees #16

EPA divers with USGS work to baseline benthic conditions at the mouth of the Elwha River before dam removal. Scuba surveys to assess effects of Elwha dam removal on shallow, subtidal benthic communities Steve Rubin, Ian Miller, Nancy Elder, Reg Reisenbichler, Rusty Rodriguez, Jeff Duda, Rob Pedersen, Mike McHenry, and Matt Beirne; USGS Western Fisheries Research Center, Seattle, WA (SR, RR, RR, JD), UC Santa Cruz, Santa Cruz, CA and WA Sea Grant, Port Angeles, WA (IM), USGS Western Fisheries Research Center Marrowstone Marine Station, Nordland, WA (NE), USEPA Region 10 Environmental Cleanup Office, Seattle, WA (RP), Lower Elwha Klallam Tribe (MM, MB). The impending removal of the Elwha River dams will affect marine habitats when sediments that have accumulated behind the dams for nearly 100 years are transported to the Strait of Juan de Fuca. Deposited and suspended sediments can have a variety of effects on marine plants and animals including burial, inhibition of propagule settlement, light reduction affecting plant growth, damage to animal gills and filter feeding structures, and alteration of interactions among species with different tolerances and responses to sediment. The initial large sediment influx from release of accumulations in the reservoirs may stress nearshore communities, but in the long run communities may benefit from reestablishment of sediment delivery from the upper watershed. Scuba surveys were initiated in 2008 to characterize nearshore biological ...



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