USGS is updating how statistical information is delivered. WaterWatch and WaterQualityWatch will be retired around February 24, 2026. Explore alternative tools and share feedback at wdfn@usgs.gov.
USGS Streamflow Duration Hydrograph Builder

For some streams, flow statistics may have been computed from mixed regulated
and unregulated flows; this can affect depictions of flow conditions.

Duration Hydrograph

Additional Information