NWS Missouri River Basin/Pleasant Hill, MO

Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  October 13, 2011

UPPER MISSOURI BASIN

SEPTEMBER PRECIPITATION WAS BELOW AVERAGE ACROSS THE UPPER 
MISSOURI BASIN.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI 
BASIN INCLUDE: MILK ST. MARY, 49 PERCENT; MILK CANADA, 34 PERCENT; 
LOWER MILK, 89 PERCENT; ABOVE TOSTON, 38 PERCENT; TOSTON TO 
FT. PECK, 24 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR 
HAD 181 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 134 PERCENT 
OF AVERAGE WATER, GIBSON RESERVOIR HAD 40 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 94 PERCENT OF AVERAGE STORED WATER.  
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE TO  BELOW AVERAGE 
RANGE; 102 AND 102 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN 

PRECIPITATION DURING THE MONTH OF SEPTEMBER WAS ABOUT 41 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 20 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 32 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, 19 PERCENT OF AVERAGE IN THE LITTLE BIGHORN-
-UPPER TONGUE BASINS, 39 PERCENT OF AVERAGE IN THE POWDER RIVER
BASIN, AND 27 PERCENT OF AVERAGE IN THE LOWER YELLOWSTONE BASIN.

MONTHEND STORAGE WAS 107 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON
THE WYOMING/MONTANA BORDER.

PLATTE BASIN

PRECIPITATION DURING SEPTEMBER IN THE PLATTE BASIN WAS BELOW AVERAGE.
PRECIPITATION IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 78 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN
BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 50
PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR
HAD 35 PERCENT OF AVERAGE PRECIPITATION. THE HIGH ELEVATIONS OF THE
SOUTH PLATTE BASIN HAD 115 PERCENT OF AVERAGE SEPTEMBER PRECIPITATION
WHEREAS THE PLAINS HAD 93 PERCENT OF AVERAGE PRECIPITATION.

STORED WATER IN THE SOUTH PLATTE BASIN WAS 124 PERCENT OF AVERAGE.
 

PRECIPITATION MAPS

September 2011	WY 2011
September 2011 Precipitation Percent of 1971-2000 Average	WY2011 Precipitation as Percent of 1971-2000 Average
September 2011 Basin Mean Precipitation	WY2011 Basin Mean Precipitation
September 2011 MBRFC Basin Mean Precipitation	WY2011 MBRFC Basin Mean Precipitation