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:  November 9, 2010

UPPER MISSOURI BASIN

OCTOBER PRECIPITATION WAS AVERAGE TO BELOW AVERAGE ACROSS THE
UPPER MISSOURI BASIN. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI
BASIN INCLUDE: MILK ST. MARY, 83 PERCENT; MILK CANADA, 73 PERCENT;
LOWER MILK, 100 PERCENT; ABOVE TOSTON, 118 PERCENT; TOSTON TO
FT. PECK, 87 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 185 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 142 PERCENT
OF AVERAGE WATER, GIBSON RESERVOIR HAD 46 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 156 PERCENT OF AVERAGE STORED WATER.
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTH END STORAGE IN THE AVERAGE TO  BELOW AVERAGE
RANGE; 107 AND 107 PERCENT OF AVERAGE WATER, RESPECTIVELY.

AS INDICATED BY THE U.S. GEOLOGICAL LONG TERM GAGING STATIONS,
THE MARIAS RIVER NEAR SHELBY, MONTANA HAD AN ESTIMATED 78 PERCENT
OF AVERAGE RUNOFF IN OCTOBER.

YELLOWSTONE BASIN

PRECIPITATION DURING THE MONTH OF OCTOBER WAS ABOUT 50 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 88 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 66 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, 66 PERCENT OF AVERAGE IN THE LITTLE BIGHORN-
-UPPER TONGUE BASINS, 47 PERCENT OF AVERAGE IN THE POWDER RIVER
BASIN, AND 70 PERCENT OF AVERAGE IN THE LOWER YELLOWSTONE BASIN.

MONTH END STORAGE WAS 98 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON
THE WYOMING/MONTANA BORDER.

RUNOFF DURING OCTOBER 2010 IN THE YELLOWSTONE RIVER WAS 82 PERCENT OF
AVERAGE AT CORWIN SPRINGS, 91 PERCENT OF AVERAGE AT BILLINGS, MONTANA.

PLATTE BASIN

PRECIPITATION DURING OCTOBER IN THE PLATTE BASIN WAS ABOVE AVERAGE.
OCTOBER PRECIPITATION IN THE NORTH PLATTE BASIN ABOVE SEMINOE RESERVOIR
WAS 182 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN SEMINOE
RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 118 PERCENT OF AVERAGE.
THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 180 PERCENT OF AVERAGE
PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 140
PERCENT OF AVERAGE OCTOBER PRECIPITATION WHEREAS THE PLAINS HAD 109 PERCENT
OF AVERAGE PRECIPITATION.

PRECIPITATION MAPS

October 2010	WY 2011
October 2010 Precipitation Percent of 1971-2000 Average	WY2011 Precipitation as Percent of 1971-2000 Average
October 2010 Basin Mean Precipitation	WY2011 Basin Mean Precipitation
October 2010 MBRFC Basin Mean Precipitation	WY2011 MBRFC Basin Mean Precipitation