Sampling and analysis plan for the Koocanusa Reservoir and upper Kootenai River, Montana, water-quality monitoring program, 2021

First posted January 25, 2023 For additional information, contact: Director, Wyoming-Montana Water Science Center U.S. Geological Survey3162 Bozeman Avenue Helena, MT 59601Contact Pubs Warehouse In 2021, the Survey will collect water-quality samples and environmental data from 3 sites in Koocanusa Reservoir 1 site Kootenai River. The transboundary is southeastern British Columbia, Canada, northwestern Montana, United States, was formed with construction of Libby Dam on River 26 kilometers upstream Libby, Montana. Two reservoir site, tailwater (the outflow flow into River), are equipped automated, high-frequency ServoSipper water samplers. At two sites, these samplers mounted to pontoon platforms automatically multiple depths; a sampler deployed at one 2019, another be second 2021. Discrete collected monthly depths river sites. goal this project multidepth, vertical temporal understand limnological biological processes that control variations trends selenium concentrations loads throughout southern end reservoir. This sampling analysis plan documents organization, data-collection scheme design, pre- post-collection processes, quality-assurance quality-control procedures.