National Weather Service River Forecast Center

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Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  December 14, 2012

UPPER MISSOURI BASIN

NOVEMBER PRECIPITATION WAS ABOVE AVERAGE ACROSS THE UPPER 
MISSOURI BASIN.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI 
BASIN INCLUDE: MILK ST. MARY, 172 PERCENT; MILK CANADA, 185 PERCENT; 
LOWER MILK, 297 PERCENT; ABOVE TOSTON, 154 PERCENT; TOSTON TO 
FT. PECK, 214 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR 
HAD 103 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 74 PERCENT 
OF AVERAGE WATER, GIBSON RESERVOIR HAD 30 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 93 PERCENT OF AVERAGE STORED WATER.  
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE RANGE; 91 AND 90 
PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

PRECIPITATION DURING THE MONTH OF NOVEMBER WAS ABOUT 112 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 98 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 118 PERCENT OF AVERAGE 
IN THE BIGHORN BASIN, 153 PERCENT OF AVERAGE IN THE LITTLE BIGHORN-
-UPPER TONGUE BASINS, 143 PERCENT OF AVERAGE IN THE POWDER RIVER 
BASIN, AND 149 PERCENT OF AVERAGE IN THE LOWER YELLOWSTONE BASIN.

MONTHEND STORAGE WAS 96 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON 
THE WYOMING/MONTANA BORDER.  
 
 
PLATTE BASIN


PRECIPITATION DURING NOVEMBER IN THE PLATTE BASIN WAS BELOW AVERAGE.  
PRECIPITATION IN THE NORTH PLATTE BASIN ABOVE SEMINOE 
RESERVOIR WAS 46 PERCENT OF AVERAGE.  IN THE NORTH PLATTE BASIN 
BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 48 
PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR 
HAD 80 PERCENT OF AVERAGE PRECIPITATION. THE HIGH ELEVATIONS OF THE 
SOUTH PLATTE BASIN HAD 25 PERCENT OF AVERAGE NOVEMBER PRECIPITATION 
WHEREAS THE PLAINS HAD 55 PERCENT OF AVERAGE PRECIPITATION.

STORED WATER IN THE SOUTH PLATTE BASIN WAS 73 PERCENT OF AVERAGE.








 
 
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