Water supply monitoring

We rely on a variety of data sources to evaluate the state's current and future water supply. Explore some of these sources here.

Rivers and streams are an important part of the state's water supply. These online tools track flow levels.

Freshwater DataStream – current and historical continuous data for rivers and streams
- Instream Flow Data – includes USGS gage (control points) identified in rule
U.S. Geological Survey – Look at daily streamflow data for Washington state
Northwest River Forecast Center – View river volume forecasts for the coming year

Mountain snow acts like a water supply reservoir as it slowly melts during spring and summer.

Natural Resources Conservation Services (NRCS):
- Predefined maps - links to snowpack maps and data
- Current Snow Water Equivalent (SWE) % of Normal - Interactive map
- Washington Snowpack Summary - Maps and Graphs
- Washington SNOTEL - Map of Current Snow Water Equivalent (SWE) % of Normal
National Weather Service:
- Regional Snow Analysis

Short and long-range climate forecasts allow us to better understand potential impacts to the state's water supply.

Contact information

Chris Anderson
Web Coordinator
chris.anderson@ecy.wa.gov
360-407-6634

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