Water Supply Statement for the Missouri River Basin issued for August 2017

Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  September 18, 2017

UPPER MISSOURI BASIN

AUGUST PRECIPITATION WAS BELOW AVERAGE ACROSS THE UPPER MISSOURI
BASIN.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE:
MILK ST. MARY, 8 PERCENT; MILK CANADA, 14 PERCENT; LOWER MILK, 44
PERCENT; ABOVE TOSTON, 51 PERCENT; TOSTON TO FT. PECK, 15 PERCENT.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 138 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 108 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 20 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 54 PERCENT OF AVERAGE STORED WATER.
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE ABOVE AVERAGE RANGE; 98 AND
115 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

PRECIPITATION DURING THE MONTH OF AUGUST WAS ABOUT 113 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 60 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 86 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, AND 84 PERCENT OF AVERAGE IN THE LITTLE
BIGHORN BASINS-UPPER TONGUE BASINS, 68 PERCENT OF AVERAGE IN THE
POWDER RIVER BASIN, AND 44 PERCENT OF AVERAGE IN THE LOWER
YELLOWSTONE BASIN.

MONTHEND STORAGE WAS 106 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON
THE WYOMING/MONTANA BORDER.
 

PLATTE BASIN

PRECIPITATION DURING AUGUST IN THE PLATTE BASIN WAS NEAR
AVERAGE. AUGUST PRECIPITATION IN THE NORTH PLATTE BASIN
ABOVE SEMINOE RESERVOIR WAS 86 PERCENT OF AVERAGE. IN THE
NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY
RESERVOIR PRECIPITATION WAS 107 PERCENT OF AVERAGE. THE NORTH
PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 93 PERCENT OF AVERAGE
PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD
95 PERCENT OF AVERAGE AUGUST PRECIPITATION WHEREAS THE PLAINS
HAD 104 PERCENT OF AVERAGE PRECIPITATION.

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

PRECIPITATION MAPS

August 2017	WY 2017
August 2017 Precipitation Percent of 1981-2010 Average	WY2017 Precipitation as Percent of 1981-2010 Average
August 2017 Basin Mean Precipitation	WY2017 Basin Mean Precipitation
August 2017 MBRFC Basin Mean Precipitation	WY2017 MBRFC Basin Mean Precipitation