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Wyoming Basin Outlook Report for
POWDER & TONGUE RIVER BASINS as of March 1, 2012

Snow Snow water equivalent (SWE) in the Upper Tongue River drainage is 135% of average. The Goose Creek drainage is 134% of average. SWE in the Clear Creek drainage is 126% of average. Crazy Woman Creek drainage is 120% of average. Upper Powder River drainage SWE is 130% of average. Powder River Basin SWE in Wyoming is 128% of average. For more information see Basin Summary of Snow Course Data at the beginning of this report. Precipitation Last month s precipitation was 187% of average for the 9 reporting stations (193% of last year). Monthly percentages range from 123- 300% of average. Year-to-date precipitation is 128% of average in the basin; this is 118% of last year at this time. Precipitation for the year ranges from 102-141% of average. Reservoir The Tongue River Reservoir currently is storing 246% of average (60,600 ac-ft) compared to 112% of last year's storage. Streamflow The 50% exceedance forecasts for the April through September period are expected to be above average for the basins. The yield for Tongue River near Dayton is 128,000 ac-ft (117% of average). Big Goose Creek near Sheridan is 72,000 ac-ft (120% of average). Little Goose Creek near Bighorn is 52,000 ac-ft (124% of average). The Tongue River Reservoir Inflow is 310,000 ac-ft (124% of average). The Middle Fork of the Powder River near Barnum is 21,000 ac-ft (112% of average). The North Fork of the Powder River near Hazelton should yield around 12,700 ac-ft (122% of average). Rock Creek near Buffalo will yield about 31,000 ac-ft (129% of average), and Piney Creek at Kearny should yield about 69,000 ac-ft (133% of average). The Powder River at Moorehead is 295,000 ac-ft (128% of average). The Powder River near Locate is 335,000 ac-ft (129% of average). See the following page for detailed runoff volumes.

Streamflow Forecasts

POWDER & TONGUE RIVER BASINS
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)

Tongue R nr Dayton (2)
APR-JUL 83       101       114       119       127       145       96      
APR-SEP 94       114       128       117       142       162       109      
Big Goose Ck nr Sheridan
APR-JUL 44       55       63       121       71       82       52      
APR-SEP 52       64       72       120       80       92       60      
Little Goose Ck nr Bighorn
APR-JUL 31       38       43       127       48       55       34      
APR-SEP 39       47       52       124       57       65       42      
Tongue River Reservoir Inflow (2)
APR-JUL 170       235       280       127       325       390       220      
APR-SEP 194       265       310       124       355       425       250      
MF Powder R nr Barnum
APR-JUL 14.2       17.6       20       112       22       26       17.8      
APR-SEP 15.0       18.6       21       112       23       27       18.7      
NF Powder R nr Hazelton
APR-JUL 8.6       10.5       11.8       123       13.1       15.0       9.6      
APR-SEP 9.4       11.3       12.7       122       14.1       16.0       10.4      
Rock Ck nr Buffalo
APR-JUL 19.4       24       27       136       30       35       19.9      
APR-SEP 23       28       31       129       34       39       24      
Piney Ck at Kearny
APR-JUL 40       55       65       133       75       90       49      
APR-SEP 44       59       69       133       79       94       52      
Powder R at Moorhead
APR-JUL 156       225       270       132       315       385       205      
APR-SEP 177       245       295       128       345       415       230      
Powder R nr Locate
APR-JUL 175       255       310       132       365       445       235      
APR-SEP 190       275       335       129       395       480       260      

    * 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

POWDER & TONGUE RIVER BASINS
Reservoir Storage (1000AF) End of February

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

TONGUE RIVER 79.1      60.6         54.1          24.6        



Watershed Snowpack Analysis

POWDER & TONGUE RIVER BASINS
Watershed Snowpack Analysis - March 1, 2012

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

UPPER TONGUE RIVER 10               130               135              
GOOSE CREEK 3               143               134              
CLEAR CREEK 4               136               126              
CRAZY WOMAN CREEK 3               108               120              
UPPER POWDER RIVER 4               117               130              
POWDER RIVER in WY 8               126               128              

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

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