Water Supply & Reservoir Storage

Streamflow Forecasting

• Water Supply Outlook Reports  (Released monthly by state, current & historic reports available)

• Western US Streamflow Forecast Maps  

• Western US Streamflow Forecast Tables

• Streamflow Forecast Probability Charts  (For selected stations in each state)

• Guide to Interpreting Streamflow Forecasts

Reservoir Storage

• Current Washington Reservoir Storage Graphic

• Current Western US Reservoir Storage Graphic

• Historic Western US Reservoir Storage Graphics 

• Monthly Reservoir Reports  (Format types: BARE, BARS)

Water Supply Forecast Maps

• Western U.S.
• Pacific Northwest (Columbia River Basin)