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Baseflow Time Series for Selected USGS Gages (ver. 2.0, October 2022)

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: July 16, 2025 | Last Modified: 20221025
Daily estimates of baseflow derived from a non-linear, baseflow separation model. The file "baseflow_western_washington.csv" has daily baseflow estimates for 268 sites in western Washington for the period from water year 1981 to 2020 used for estimating groundwater recharge in lowland areas. The file "baseflow_rsqa.csv" has daily baseflow estimates for 462 sites that were sampled as part of the US Geological Survey Regional Stream Qualtiy Assessment (RSQA). Values are only provided for days when water samples were collected. Missing values indicate gaps in the streamflow record.

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