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Instream Flow Data


Water Resource Inventory Area (WRIA)

Find data for WRIAs with established instream flows using the pull-down menu above this map. Select gage stations / control points on the map or in the table below it for data and graphs comparing legal instream flow amounts to actual water levels for each station.


Water availability in your WRIA
We are posting water availability focus sheetsopen_in_new for each WRIA in the state so you can learn more about the key factors affecting water availability.

USGS control points and Ecology gaging stations

Station Web Page Agency Station ID Station Name Reported Discharge Minimum Discharge Rule Below Min Discharge Reported on
Visit ECY Web Page for 01C070 ECY 01C070 Hutchinson Creek near Acme 10.34 11/14/2026 4:30:00 PM
Visit ECY Web Page for 01N060 ECY 01N060 Bertrand Cr. nr mouth 51.92 11/14/2026 6:30:00 PM
Visit ECY Web Page for 01Q070 ECY 01Q070 Dakota Cr. @ Giles Rd. 10.52 11/14/2026 4:30:00 PM

About instream flows

Instream flowsopen_in_new are an amount of water, established by rule and court decisions, in a given river or stream. They usually vary from month to month, since seasonal changes cause natural streamflow to vary. These graphs compare the legal instream flow amounts to actual water levels. When actual streamflows drop below the adopted instream flow levels, junior water rightsopen_in_new (those established after the instream flow) can be temporarily interrupted to keep the water in the stream.

In your watershedopen_in_new contains more information about all 62 Washington watersheds, also called WRIAs. See our lookup toolopen_in_new to find your WRIA.