Water Supply & Reservoir Storage

Streamflow Forecasting

• Water Supply Outlook Reports (WSOR)  (Released monthly Jan-Jun 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 Oregon Reservoir Storage Graphic

• Current Western US Reservoir Storage Graphic

• Historic Western US Reservoir Storage Graphics 

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

Surface Water Supply Index (SWSI) 

• Current and Historic SWSI Values for Oregon Basins - maps & graphs updated monthly

• Download comma-delimited file of all historic SWSI values - updated monthly