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Aquatic invertebrate abundance in the Elwha River estuary, Washington, in 2007 and 2013


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Foley, M.M., Shafroth, P.B., Beirne, M.M., Paradis, R., Ritchie, A.C., and Duda, J.J., 2020, Ecological parameters in the Elwha River estuary before and during dam removal (ver. 2.0, August 2020): U.S. Geological Survey data release,


This portion of the data release presents aquatic invertebrate abundance data from samples collected in the Elwha River estuary, Washington, in 2007 and 2013 (no associated USGS Field Activities numbers because data were collected predominantly by biologists from the Lower Elwha Klallam Tribe). Replicate benthic samples were collected at 18 locations throughout the estuary complex using a petite Ponar grab sampler (appx. 2400 mL sample) and sorted through a 500-micron sieve. Samples were fixed in 10 percent formalin for 3 to 5 days before being transferred to 70 percent ethanol until processing. Individuals were identified to the lowest possible taxonomic resolution, but are grouped according to insect Orders in the data for consistency [...]


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Elwha_estuary_aquatic invertebrates_2007-2013.csv 7.02 KB


Data were obtained to assess the change in aquatic invertebrate abundance and diversity in the Elwha estuary following the removal of two dams on the Elwha River between 2011 and 2014.



  • Pacific Coastal and Marine Science Center



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