Baseflow Fractions at USGS Gages for Water Years 1981 to 2020 (ver. 2.0, October 2022)
Simulated daily baseflow was summed from water year 1981 to 2020 and divided by observed streamflow at 13,208 sites where US Geological Survey operated a streamflow gage and calculated daily streamflow for at least 300 days. Days with negative flows (tidal systems) are not included.