February 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
FEBRUARY 1 WAS ABOVE AVERAGE. THE SNOW PACK ABOVE TOSTON,
MONTANA WAS 112 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 111 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 114 PERCENT.
JANUARY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS NEAR TO
ABOVE AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 63 PERCENT; MILK CANADA, 163 PERCENT;
LOWER MILK, 372 PERCENT; ABOVE TOSTON, 79 PERCENT; TOSTON TO
FT. PECK, 144 PERCENT.
January 2011 Upper Missouri Mean Precip Oct-Jan 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 105 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 105 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE
MILK RIVER BASIN CALL FOR AROUND 117 PERCENT OF AVERAGE SPRING SUMMER
RUNOFF.
Upper Missouri February 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 113 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 34 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 127 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE RANGE; 96 AND 103 PERCENT
OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS AVERAGE TO
ABOVE AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE
BASIN WAS 114 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN,
AND SHOSHONE BASINS WERE 104, 108, AND 104 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
105 AND 117 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION DURING JANUARY RANGED FROM BELOW OR ABOVE AVERAGE.
THE UPPER YELLOWSTONE RIVER BASIN RECEIVED 77 PERCENT OF AVERAGE
PRECIPITATION WHILE THE LOWER YELLOWSTONE BASIN REPORTED 187 PERCENT
OF AVERAGE. THE BIGHORN BASIN RECEIVED 98 PERCENT OF AVERAGE
PRECIPITATION WHILE THE WIND RIVER BASIN RECEIVED 75 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 138 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 159 PERCENT OF AVERAGE PRECIPITATION.
January 2011 Yellowstone Mean Precip Oct-Jan WY2011 Yellowstone Mean Precip
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS IN THE NEAR TO ABOVE
AVERAGE RANGE FOR THE UPCOMING SPRING AND SUMMER. RUNOFF AT
BILLINGS, MONTANA IS EXPECTED TO BE 106 PERCENT OF AVERAGE. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE ABOUT 95 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 94 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 102 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 96 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 108 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 99 PERCENT OF AVERAGE AT BIGHORN LAKE.
Yellowstone February 1, 2011 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
132 PERCENT OF AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 116 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 118 PERCENT OF AVERAGE.
JANUARY PRECIPITATION ACROSS THE PLATTE BASIN WAS AVERAGE. PRECIPITATION
DURING JANUARY IN THE NORTH PLATTE BASIN ABOVE SEMINOE RESERVOIR WAS 93
PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR
AND GUERNSY RESERVOIR PRECIPITATION WAS 94 PERCENT OF AVERAGE. THE NORTH
PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 110 PERCENT OF AVERAGE
PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 101
PERCENT OF AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD 97 PERCENT OF
AVERAGE JANUARY PRECIPITATION.
January 2011 Platte Mean Precip Oct-Jan 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 ABOUT
120 TO 150 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE 100 TO 140 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
50 TO 125 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 99 PERCENT OF AVERAGE
ON FEBRUARY 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 130
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
