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Baseflow Fractions for Water Years 1981 to 2020 (ver. 3.0, December 2025)

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: August 01, 2026 at 06:01 AM | Dataset Last Updated: December 09, 2025 at 12:00 AM
Simulated daily baseflow was summed from water year 1981 to 2020 and divided by observed streamflow at 11,985 sites with streamflow gages. Daily baseflow was limited to observed streamflow prior to summation. Days with negative flows (tidal systems) are not included.

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