The impact of pesticide use practices on the quality of fresh water resources in the Pacific Northwest and California utilized by threatened and endangered Pacific salmonids is a concern. In this study, continuous pesticide surface water monitoring and ecohydrological modeling were used to estimate pesticide exposure patterns that overlap with salmonid life history strategies. The study site was the Zollner Creek watershed located in the Molalla-Pudding River Basin (HUC8: 17090009) in the Willamette Valley, OR, which contains critical habitat designated for the Upper Willamette River Chinook and Steelhead. Continuous pesticide monitoring employing lipid-free tubing (LFT) passive sampling devices identified several pesticides included in National Marine Fisheries Service biological opinions. Results of Soil and Water Assessment Tool (SWAT) modeling, which relate pesticide use practices to monitoring data and evaluate alternative mitigation strategies, are reported.

Integration of pesticide surface water monitoring and watershed scale ecohydrological modeling to assess exposure to ESA listed Pacific salmonids

248th National Meeting (2014)

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