March 1, 2011 Spring and Summer Streamflow Forecasts
Missouri River Basin Streamflow Forecast Missouri River Basin Mountain Snowpack
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
MARCH 1 WAS ABOVE AVERAGE. THE SNOW PACK ABOVE TOSTON,
MONTANA WAS 106 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 118 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 117 PERCENT.
FEBRUARY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS ABOVE TO
MUCH ABOVE AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI
BASIN INCLUDE: MILK ST. MARY, 214 PERCENT; MILK CANADA, 149 PERCENT;
LOWER MILK, 139 PERCENT; ABOVE TOSTON, 105 PERCENT; TOSTON TO
FT. PECK, 195 PERCENT.
February 2011 Upper Missouri Mean Precip Oct-Feb WY2011 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE NEAR TO
ABOVE AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 110 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 100 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE
MILK RIVER BASIN CALL FOR AROUND 130 TO 160 PERCENT OF AVERAGE SPRING
SUMMER RUNOFF.
Upper Missouri March 1, 2011 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 147 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 110 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 32 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 133 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE RANGE; 94 AND 104 PERCENT
OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS E AVERAGE ON
MARCH 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS 110 PERCENT
OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND SHOSHONE BASINS
WERE 103, 98, AND 104 PERCENT OF AVERAGE, RESPECTIVELY. THE SNOW PACKS
IN THE TONGUE AND POWDER BASINS WERE 105 AND 112 PERCENT OF AVERAGE,
RESPECTIVELY.
PRECIPITATION DURING FEBRUARY RANGED FROM ABOVE TO MUCH ABOVE AVERAGE.
THE UPPER YELLOWSTONE RIVER BASIN RECEIVED 119 PERCENT OF AVERAGE
PRECIPITATION WHILE THE LOWER YELLOWSTONE BASIN REPORTED 216 PERCENT
OF AVERAGE. THE BIGHORN BASIN RECEIVED 160 PERCENT OF AVERAGE
PRECIPITATION WHILE THE WIND RIVER BASIN RECEIVED 175 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 125 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 175 PERCENT OF AVERAGE PRECIPITATION.
February 2011 Yellowstone Mean Precip Oct-Feb WY2011 Yellowstone Mean Precip
STREAM FLOW IN THE YELLOWSTONE BASIN IS FORECAST TO BE MOSTLY ABOUT
AVERAGE DURING THE UPCOMING SPRING AND SUMMER. RUNOFF AT
BILLINGS, MONTANA IS EXPECTED TO BE 107 PERCENT OF AVERAGE, WITH
A PROBABLE RANGE BETWEEN 80 AND 130 PERCENT OF AVERAGE. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE 98 PERCENT OF AVERAGE WITH A PROBABLE RANGE
OF 58 TO 139 PERCENT OF AVERAGE. FLOW IN THE TONGUE BASIN IS
EXPECTED TO BE 88 PERCENT OF AVERAGE WITH A REASONABLY LIKELY RANGE
OF 42 TO 134 PERCENT OF AVERAGE FLOW. FLOWS IN THE POWDER RIVER ARE
EXPECTED TO BE ABOUT 98 PERCENT OF AVERAGE WITH A REASONABLY LIKELY
RANGE OF 42 TO 154 PERCENT.
END-OF-FEBRUARY RESERVOIR STORAGE IN WYOMING WAS 98 PERCENT OF
AVERAGE IN BOYSEN RESERVOIR AND 108 PERCENT OF AVERAGE IN BUFFALO
BILL RESERVOIR. MONTHEND STORAGE WAS 103 PERCENT OF AVERAGE IN
BIGHORN RESERVOIR ON THE WYOMING/MONTANA BORDER.
Yellowstone March 1, 2011 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
130 PERCENT OF AVERAGE ON MARCH 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 119 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 123 PERCENT OF AVERAGE.
FEBRUARY PRECIPITATION ACROSS THE PLATTE BASIN WAS ABOVE AVERAGE.
PRECIPITATION DURING FEBRUARY IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 109PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN
SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 142 PERCENT
OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 117
PERCENT OF AVERAGE PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH
PLATTE BASIN HAD 172 PERCENT OF AVERAGE PRECIPITATION WHEREAS THE PLAINS
HAD 194 PERCENT OF AVERAGE FEBRUARY PRECIPITATION.
February 2011 Platte Mean Precip Oct-Feb WY2011 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO RANGE FROM AVERAGE
TO ABOVE AVERAGE DURING THE UPCOMING SPRING AND SUMMER.
RUNOFF FOR STREAMS ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE FROM
130 TO 140 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE 100 TO 150 PERCENT OF
AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE,
COLORADO CAN EXPECT 70 TO 110 PERCENT OF AVERAGE FLOW. FOR THE
REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED VARY FROM
65 TO 125 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 100 PERCENT OF AVERAGE
ON MARCH 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 131
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
