Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  September 12, 2006


Precipitation in the Missouri Basin was highly variable during
August. Streamflow data indicates the flows for the month of August
were below average. 

Precipitation in the Missouri Basin during Auguist ranged from below
average to above average, with Monatana and Northwestern Wyoming  
reporting below average precipitation.  Precipitation in Montana was
generally below average, with amounts  ranging from a 7 percent of
average (0.8 in.)at Miles City 2NW to 305 percent of average (3.39 in.)
at Ekalaka 30S,  Montana.  Precipitation in Wyoming ranged form  below
to above average with reports ranging from 0 percent of average
(0.00 in.) at Cody 12Se and Emblem to 460 percent of average (6.67 in.)
at La Grange, Wyoming. Precipitation in Northeastern Colorado was highly
variable, with reports ranging from 48 percent of average (0.86 in.)  at
Briggsdale, Colorado to 236 percent of average (5.70 in.) at Antro,
Colorado.


Basin precipitation summaries for the Missouri Basin:


Basin                            Average Precipitation
Milk St. Mary                             50%
Milk Canada                             36%
Lower Milk                                56%
Above Toston                           45%
Toston to Ft. Peck                   59%
Upper Yellowstone                  40%
Wind River                               75%
Bighorn                                     45%
Little Bighorn Tongue             39%
Powder                                    44%
Lower Yellowstone                 58%
Upper North Platte               110%
Lower North Platte               107%
South Platte Mountains       118%
South Platte Plains              108%




August 2006 Basin Mean Precipitation

Stored  water in the  South  Platte  Basin as of  September 1 was 71
percent of  average for this time of the year.  Of the four major
irrigation  reservoirs in Montana, Lima  Reservoir had 123 percent 
average  storage; Clark Canyon was holding 50 percent of average water,
Gibson Reservoir had 19 percent of average stored water and  Fresno
Reservoir  had  57  percent  of average stored water.  Of the three
major hydroelectric  reservoirs in Montana, Canyon  Ferry and Fort
Peck had  monthend storage in the average range; 95 and 61 percent
of average water, respectively.  Bighorn reservoir was holding 73
percent of average stored water.

Runoff during August, as indicated by U.S.  Geological Survey long
term gaging  stations,  was  below  average.  The  Marias  River 
near Shelby,   Montana   had  37  percent  of   average   runoff.
The Yellowstone  River was estimated to have had 63  percent  of
average  runoff at Corwin Springs,  while at  Billings,  Montana
runoff was 43 percent of average.


      

          Precipitation Maps

 
      August 2006       Oct-Aug WY 2006

                          

August 2006 Precipitation Percent of 1971-2000 Average  Oct-Aug WY2006 Precipitation as Percent of 1971-2000 Average


August 2006 Basin Mean Precipitation                    Oct-Aug WY2006 Basin Mean Precipitation

                               

August 2006 MBRFC Basin Mean Precipitation              Oct-Aug WY2006 MBRFC Basin Mean Precipitation


 

 


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