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:  September 14, 2012

UPPER MISSOURI BASIN

AUGUST PRECIPITATION WAS BELOW AVERAGE ACROSS THE UPPER MISSOURI
BASIN.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE:
MILK ST. MARY, 34 PERCENT; MILK CANADA, 44 PERCENT; LOWER MILK, 67
PERCENT; ABOVE TOSTON, 40 PERCENT; TOSTON TO FT. PECK, 39 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 112 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 72 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 20 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 101 PERCENT OF AVERAGE STORED WATER.
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE ABOVE AVERAGE RANGE; 97 AND
95 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

PRECIPITATION DURING THE MONTH OF AUGUST WAS ABOUT 10 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 27 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 16 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, AND 22 PERCENT OF AVERAGE IN THE LITTLE
BIGHORN BASINS-UPPER TONGUE BASINS, 25 PERCENT OF AVERAGE IN THE
POWDER RIVER BASIN, AND 42 PERCENT OF AVERAGE IN THE LOWER
YELLOWSTONE BASIN.

MONTH END STORAGE WAS 94 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON
THE WYOMING/MONTANA BORDER.

PLATTE BASIN

PRECIPITATION DURING AUGUST IN THE PLATTE BASIN WAS BELOW
AVERAGE. AUGUST PRECIPITATION IN THE NORTH PLATTE BASIN
ABOVE SEMINOE RESERVOIR WAS 44 PERCENT OF AVERAGE. IN THE
NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY
RESERVOIR PRECIPITATION WAS 22 PERCENT OF AVERAGE. THE NORTH
PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 12 PERCENT OF AVERAGE
PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD
39 PERCENT OF AVERAGE AUGUST PRECIPITATION WHEREAS THE PLAINS
HAD 9 PERCENT OF AVERAGE PRECIPITATION.

STORED WATER IN THE SOUTH PLATTE BASIN STORED WATER WAS 79 PERCENT OF AVERAGE.

PRECIPITATION MAPS

August 2012	WY 2012
August 2012 Precipitation Percent of 1971-2000 Average	WY2012 Precipitation as Percent of 1971-2000 Average
August 2012 Basin Mean Precipitation	WY2012 Basin Mean Precipitation
August 2012 MBRFC Basin Mean Precipitation	WY2012 MBRFC Basin Mean Precipitation