Since 2004, we have collected water chemistry data and stable isotope ratios of carbon (d¹³C) and nitrogen (d¹⁵N) to document changes in salmon-derived nutrients in the Elwha River prior, during, and post dam removal. Isotope samples are being collected from periphyton, macroalgae, benthic macroinvertebrates, and juvenile and adult salmonids.

This data is subject to provisions and interpretation. Please cite as "NOAA Fisheries. 2022. Elwha Dam Removal Water Chemistry and Stable Isotopes Dataset."

For additional information, see:

Duda, et al. 2011. Establishing spatial trends in water chemistry and stable isotopes (d¹⁵N and d¹³C) in the Elwha River prior to dam removal and salmon recolonization. River Research and Applications, 27(10), pp.1169-1181. https://doi.org/10.1002/rra.1413

Tonra, et al. 2015. The rapid return of marine-derived nutrients to a freshwater food web following dam removal. Biological Conservation, 192, pp.130-134. http://dx.doi.org/10.1016/j.biocon.2015.09.009

Morley, et al. 2016. Seasonal variation exceeds effects of salmon carcass additions on benthic food webs in the Elwha River. Ecosphere, 7(8), p.e01422. https://doi.org/10.1002/ecs2.1422

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