United States Department of Agriculture
Natural Resources Conservation Service
National Water and Climate Center Go to Accessibility Information
Skip to Page Content
Mountain snow photo

Wyoming Basin Outlook Report for
LITTLE SNAKE RIVER BASIN as of March 1, 2012

Snow Currently, snow water equivalent (SWE) in the Little Snake River drainage is 83% of average. For more information see Basin Summary of Snow Course Data at the beginning of this report. Precipitation Precipitation across the basin was 133% of average (121% of last year) for the 5 reporting stations. Last month s precipitation ranged from 106-166% of average. The Little Snake River basin water-year-to-date precipitation is currently 88% of average (67% of last year). Year-to-date percentages range from 71-101% of average. Reservoir High Savery Dam - 11,835 ac-ft Streamflow The 50% exceedance forecast for the April through July time frame on the Little Snake River drainage is expected to be below average this year. The Little Snake River near Slater should yield around 130,000 ac-ft (82% of average). The Little Snake River at Savery is estimated to yield around 270,000 ac-ft (82% of average). See the following table for more detailed information on projected runoff.

Streamflow Forecasts

Streamflow Forecasts - March 1, 2012

 <==== Drier === Future Conditions === Wetter ====> 
Forecast Pt============ Chance of Exceeding * =========== 
   Forecast90%70%50% (Most Prob)30%10%30 Yr Avg
   Period(1000AF)(1000AF)(1000AF)(% AVG.)(1000AF)(1000AF)(1000AF)

Little Snake R nr Slater (2)
APR-JUL 89       113       130       82       149       178       159      
Little Snake R nr Savery (2)
APR-JUL 170       225       270       82       320       390       330      

    * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the
       actual flow will exceed the volumes in the table.

    (1) - The values listed under the 10% and 90% Change of Exceeding are
            actually 5% and 95% exceedance levels.
    (2) - The value is natural flow - actual flow may be affected by upstream
            water management.

Watershed Snowpack Analysis

Watershed Snowpack Analysis - March 1, 2012

 Number ofThis Year as Percent of
Watershed Data Sites Last Year Normal

LITTLE SNAKE RIVER 8               69               83              

Return to the Table of Contents

E-mail Questions or Comments

or Write:
D. Lee Hackleman, Water Supply Specialist
Natural Resources Conservation Service
100 East B Street
Casper, WY 82601
(307) 261-6481

Shared Bottom Border