Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  July 9, 2007


Most of the Missouri basin reported below average precipitation
during the month of June. Also, streamflow data indicates the
flows for June were below average.

Precipitation in Montana was below average with amounts ranging
from 9 percent of average (0.23 in.) at Cut Bank 3SSW, Montana to
289 percent of average (6.39 in.) Hardin 34SSW, Montana. Precipitation
in Wyoming was generally below average with near average precipitation
being reported across the Powder and Little Bighorn Tongue basins.
Reports ranged from 0 percent of average (0.00 in.) at several
locations across Wyoming to 189 percent of average (2.32 in.)
at Powell 23NW, Wyoming. Precipitation in northeastern Colorado was
below average, with reports ranging from 0 percent of average (0.00 in.)
at several locations across the state to 154 percent of average
(3.90 in.) at Wray 2E, Colorado.

Basin precipitation summaries for the Missouri Basin:

Basin Average Precipitation
Milk St. Mary 44%
Milk Canada 52%
Above Toston 74%
Toston to Ft. Peck 75%
Lower Milk 93%
Upper Yellowstone 86%
Wind River 59%
Bighorn 75%
Little Bighorn Tongue 112%
Powder 103%
Lower Yellowstone 101%
Upper North Platte 53%
Lower North Platte 51%
North Platte Plains 17%
South Platte Mountains 40%
South Platte Plains 49%


June 2007 Basin Mean Precipitation


Stored water in the South Platte Basin as of July 1 was 93
percent of average for this time of the year. Stored water in the
North Platte Basin was MISSING of average July 1 storage. Buffalo Bill
Reservoir held 102 percent of average July 1 storage. Of the four
major irrigation reservoirs in Montana, Lima Reservoir had 74 percent
average storage; Clark Canyon was holding 63 percent of average water,
Gibson Reservoir had 81 percent of average stored water and Fresno
Reservoir had 85 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; 99 and 56 percent of average water,
respectively. Bighorn reservoir was holding 102 percent of average
stored water.

Runoff during June, as indicated by U.S. Geological Survey long
term gaging stations, was below average. The Marias River near
Shelby, Montana had 38 percent of average runoff. The Yellowstone
River was estimated to have had 44 percent of average runoff at
Corwin Springs, while at Billings, Montana runoff was 57 percent of
average.

 

          Precipitation Maps

 
          June 2007        Oct-June WY 2007

                          

June 2007 Precipitation Percent of 1971-2000 Average  Oct-June  WY2007 Precipitation as Percent of 1971-2000 Average


June 2007 Basin Mean Precipitation                    Oct-Jun WY2007 Basin Mean Precipitation

                               

June 2007 MBRFC Basin Mean Precipitation              Oct-Jun WY2007 MBRFC Basin Mean Precipitation

 


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