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Natural Resources Conservation Service
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National Water and Climate Center


Map Products

Water Supply Forecasts

Streamflow Forecast Map      
1st of Month
West-wide map % of Average
Regional maps % of Average by region:
Arkansas, Colorado and Rio Grande Basins
Columbia Basin
Great Basin and California
Missouri Basin

Maps display the 50% exceedance forecast.  Maps are published January through May. For the 90%, 70%, 30% and 10% exceedance forecasts, consult the Historical Basin Outlook Reports and the State Basin Outlook Reports.  For more information on interpreting exceedance forecasts, refer to Forecasting.