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

Snow The Wind River Basin above Boysen Reservoir is 99% of average for snow water equivalent at this time of the year. SWE in the Wind River above Dubois is 99% of average. The Little Wind SWE is 101% of average, and the Popo Agie drainage SWE is about 94% of average. See the Basin Summary of Snow Course Data at the front of this report for details. Precipitation Last month s precipitation in the basin varied from 111-154% of average. Precipitation, for the basin, was about 127% of average from the 8 reporting stations; that is about 132% of last year's amount. Water year-to-date precipitation is 99% of average and about 101% of last year at this time. Year-to-date percentages range from 84-121% of average. Reservoirs Current storage varies from 106-126% of average. Current storage in Bull Lake is about 93,600 ac-ft (110% of average) - the reservoir is at 133% of last year. Boysen Reservoir is storing about 106% of average (608,100 ac-ft) the reservoir is about 109% of last year. Pilot Butte is at 126% of average (25,100 ac-ft) the reservoir is at 101% of last year. Detailed reservoir data is shown on the following page and on the reservoir storage summary at the beginning of this report. Streamflow The 50% exceedance forecasts for the April through September runoff period for the basin are below average. Dinwoody Creek near Burris is 93,000 ac-ft (99% of average). The Wind River above Bull Lake Creek is 505,000 ac-ft (94% of average). Bull Lake Creek near Lenore is 178,000 ac-ft (98% of average). Wind River at Riverton will yield around 570,000 ac-ft (89% of average). Little Popo Agie River near Lander is around 51,000 ac-ft (96% of average). South Fork of Little Wind near Fort Washakie will yield around 82,000 ac- ft (98% of average). Little Wind River near Riverton will yield around 300,000 ac-ft (95% of average). Boysen Reservoir inflow will yield around 710,000 ac-ft (88% of average). See the following page for detailed runoff volumes.

Streamflow Forecasts

WIND RIVER BASIN
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)

Dinwoody Ck nr Burris
APR-JUL 53       61       66       99       71       79       67      
APR-SEP 76       86       93       99       100       110       94      
Wind R ab Bull Lake Ck (2)
APR-JUL 305       370       415       95       460       525       435      
APR-SEP 375       455       505       94       555       635       535      
Bull Lake Ck nr Lenore
APR-JUL 114       133       145       98       157       176       148      
APR-SEP 140       162       178       98       194       215       182      
Wind R at Riverton (2)
APR-JUL 330       425       490       90       555       650       545      
APR-SEP 380       495       570       89       645       760       640      
Little Popo Agie R nr Lander
APR-JUL 29       38       44       96       50       59       46      
APR-SEP 35       44       51       96       58       67       53      
SF Little Wind R nr Fort Washakie
APR-JUL 52       64       72       99       80       92       73      
APR-SEP 59       73       82       98       91       105       84      
Little Wind R nr Riverton
APR-JUL 136       215       265       95       315       395       280      
APR-SEP 159       245       300       95       355       440       315      
Boysen Reservoir Inflow (2)
APR-JUL 260       490       645       90       800       1030       717      
APR-SEP 280       535       710       88       885       1140       809      

    * 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.



Reservoir Storage

WIND RIVER BASIN
Reservoir Storage (1000AF) End of February

 Usable************* Usable Storage *************
Reservoir Capacity This Year Last Year Average

BULL LAKE 151.8      93.6         70.5          85.4        
BOYSEN 596.0      608.1         557.8          571.4        
PILOT BUTTE 31.6      25.1         24.9          19.9        



Watershed Snowpack Analysis

WIND RIVER BASIN
Watershed Snowpack Analysis - March 1, 2012

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

WIND RIVER above Dubios 8               100               99              
LITTLE WIND 2               109               101              
POPO AGIE 7               90               94              
WIND above Boysen Resv 15               99               100              

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

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