Water Supply Statement for the Missouri River Basin issued for August 2015

Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  September 16, 2015

UPPER MISSOURI BASIN

AUGUST PRECIPITATION WAS MAINLY BELOW AVERAGE ACROSS THE UPPER MISSOURI
BASIN.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE:
MILK ST. MARY, 56 PERCENT; MILK CANADA, 46 PERCENT; LOWER MILK, 100
PERCENT; ABOVE TOSTON, 68 PERCENT; TOSTON TO FT. PECK, 67 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 41 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 64 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 22 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 124 PERCENT OF AVERAGE STORED WATER.
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE ABOVE AVERAGE RANGE; 95 AND
112 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

PRECIPITATION DURING THE MONTH OF AUGUST WAS ABOUT 64 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 127 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 95 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, AND 110 PERCENT OF AVERAGE IN THE LITTLE
BIGHORN BASINS-UPPER TONGUE BASINS, 153 PERCENT OF AVERAGE IN THE
POWDER RIVER BASIN, AND 120 PERCENT OF AVERAGE IN THE LOWER
YELLOWSTONE BASIN.

MONTHEND STORAGE WAS 105 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 88 PERCENT OF AVERAGE. IN THE
NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY
RESERVOIR PRECIPITATION WAS 57 PERCENT OF AVERAGE. THE NORTH
PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 45 PERCENT OF AVERAGE
PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD
55 PERCENT OF AVERAGE AUGUST PRECIPITATION WHEREAS THE PLAINS
HAD 86 PERCENT OF AVERAGE PRECIPITATION.

STORED WATER IN THE SOUTH PLATTE BASIN STORED WATER WAS 121 PERCENT
OF AVERAGE.
 

PRECIPITATION MAPS

August 2015	WY 2015
August 2015 Precipitation Percent of 1981-2010 Average	WY2015 Precipitation as Percent of 1981-2010 Average
August 2015 Basin Mean Precipitation	WY2015 Basin Mean Precipitation
August 2015 MBRFC Basin Mean Precipitation	WY2015 MBRFC Basin Mean Precipitation