River and Stream Flow Monitoring
We measure how much water flows through rivers and streams
The Department of Ecology’s Environmental Assessment Program maintains a network of stream gaging stations that produce near real-time streamflow data for rivers and streams across the state. Data are used for everything from weekend boating plans to flood warnings and climate-change strategies.
All of the data we collect are available to view and download.
How are Washington rivers and streams doing right now?
Check out our new Statewide Stream Summary Map to see nearly real-time summaries of streamflow around the state. Color-coded dots can show you if your stream is high or dry.
Click the link above or on the picture to the right to go the map. Scroll through the legend on the right side of the map to learn more.
Description: Statewide Streamflow Summary Map has more details about the map, as well.
Find river and stream data
Click the map below to find current and archival streamflow data collected by Ecology's Environmental Assessment Program.
To view or download data, click the map below, or choose by watershed/ WRIA.
Current data are shown at active monitoring stations. Historical data are shown at stations where monitoring has been discontinued, due to project duration or budget reduction. Rain gauge data come from the cooperative rain gage network.
Learn about streamflow monitoring methods
Streamflow Methods describes how Ecology hydrologists measure how much water is flowing through Washington rivers and streams.
Contact the Stream Hydrology Team.
Vital Signs for Summer Stream Flow links to the Puget Sound Partnership.
US Geologic Survey Washington Water Science Center measures some sites.
Ecology Video: "Rain Gages for the Carlton Complex Fires"
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