NWS Missouri Basin/Pleasant Hill, MO

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	WY 2006
August 2006 Precipitation Percent of 1971-2000 Average	WY2006 Precipitation as Percent of 1971-2000 Average
August 2006 Basin Mean Precipitation	WY2006 Basin Mean Precipitation
August 2006 MBRFC Basin Mean Precipitation	WY2006 MBRFC Basin Mean Precipitation