Dissolved-Selenium Concentrations and Loads in the Lower Gunnison River Basin, Colorado, as Part of the Selenium Management Program (ver. 5.0, September 2025)

Project Title:  View help for Project Title Dissolved-Selenium Concentrations and Loads in the Lower Gunnison River Basin, Colorado, as Part of the Selenium Management Program (ver. 5.0, September 2025)

Summary:  View help for Summary The U.S. Geological Survey (USGS), in cooperation with the Bureau of Reclamation, completed a review of dissolved selenium data collected from the Selenium Management Program network during each water year (WY) in the lower Gunnison River Basin, in western Colorado. The data tables include dissolved-selenium concentrations, selected streamflow data, and computed loads as well as dissolved-selenium regression model calibration and output tables. Concentration and streamflow data are compiled from the USGS National Water Information System database. Tables include monitoring location identification information, data collection time frames, concentration data, as well as calculations of mean, median, select percentiles, and percentage reduction in loads. Tables are organized by each year, with a zipped folder for WY 2018 (October 1, 2017 through September 30, 2018), WY 2019 (October 1, 2018 through September 30, 2019), WY 2020 (October 1, 2019 through September 30, 2020), WY 2021 (October 1, 2020 through September 30, 2021), WY 2022 (October 1, 2021 through September 30, 2022), WY 2023 (October 1, 2022 through September 30, 2023), and WY 2024 (October 1, 2023 through September 30, 2024). Within each zipped folder is a metadata .xml file describing each comma-separated value (.csv) data file contained therein. The methods used to complete this review are available in Henneberg (2018) and Mayo and Leib (2012). Version 5.0 contains additional zipped folder for WY2024, which was not included in the original data release. Although previous versions are available from the author, all records in previous versions can be found in version 5.0. First posted - April 23, 2021 (available from author) Revised - September 2, 2022 (version 2.0) Revised - August 8, 2023 (version 3.0) Revised - March 4, 2025 (version 4.0) Revised - September 24, 2025 (version 5.0)

Original Distribution URL:  View help for Original Distribution URL https://www.sciencebase.gov/catalog/item/5fa32162d34e198cb7960c42

Subject Terms:  View help for Subject Terms Gunnison River; selenium; water quality

Geographic Coverage:  View help for Geographic Coverage Colorado, United States

Time Period(s):  View help for Time Period(s) 1/1/1986 – 9/30/2025

Collection Notes:  View help for Collection Notes (Downloaded 2025-11-25)