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:  July 10, 2012

UPPER MISSOURI BASIN

JUNE PRECIPITATION RANGED FROM ABOVE TO BELOW AVERAGE ACROSS THE UPPER MISSOURI
BASIN.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE:
MILK ST. MARY, 133 PERCENT; MILK CANADA, 137 PERCENT; LOWER MILK, 84
PERCENT; ABOVE TOSTON, 44 PERCENT; TOSTON TO FT. PECK, 77 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 158 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 86 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 105 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 118 PERCENT OF AVERAGE STORED WATER.
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE ABOVE AVERAGE RANGE; 100 AND
99 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

PRECIPITATION DURING THE MONTH OF JUNE WAS ABOUT 7 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 37 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 21 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, AND 27 PERCENT OF AVERAGE IN THE LITTLE
BIGHORN BASINS-UPPER TONGUE BASINS, 35 PERCENT OF AVERAGE IN THE
POWDER RIVER BASIN, AND 35 PERCENT OF AVERAGE IN THE LOWER
YELLOWSTONE BASIN.

MONTH END STORAGE WAS 99 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON
THE WYOMING/MONTANA BORDER. MONTHEND STORAGE WAS NOT REPORTED AT
BOYSEN RESERVOIR OR AT BUFFALO BILL RESERVOIR IN WYOMING.

PLATTE BASIN

PRECIPITATION DURING JUNE IN THE PLATTE BASIN WAS BELOW AVERAGE. JUNE

PRECIPITATION IN THE NORTH PLATTE BASIN ABOVE SEMINOE RESERVOIR WAS 7

PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR

AND GUERNSY RESERVOIR, PRECIPITATION WAS 23 PERCENT OF AVERAGE. THE NORTH PLATTE

BASIN BELOW GUERNSY RESERVOIR HAD 71 PERCENT OF AVERAGE PRECIPITATION. THE HIGH

ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 35 PERCENT OF AVERAGE JUNE PRECIPITATION,

WHERE AS THE PLAINS HAD 48 PERCENT OF AVERAGE PRECIPITATION.

STORED WATER IN THE SOUTH PLATTE BASIN STORED WATER WAS 137 PERCENT OF

AVERAGE WITH INDIVIDUAL RESERVOIRS RANGING FROM 50 TO 920 PERCENT OF AVERAGE.

PRECIPITATION MAPS

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