January 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
JANUARY 1 WAS NEAR TO ABOVE AVERAGE. THE SNOW PACK ABOVE TOSTON,
MONTANA WAS 117 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 106 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 96 PERCENT.
DECEMBER PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS NEAR TO
ABOVE AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 90 PERCENT; MILK CANADA, 88 PERCENT;
LOWER MILK, 215 PERCENT; ABOVE TOSTON, 146 PERCENT; TOSTON TO
FT. PECK, 176 PERCENT.
December 2010 Upper Missouri Mean Precip Oct-Dec 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 97 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 108 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE
MILK RIVER BASIN CALL FOR AROUND 105 PERCENT OF AVERAGE SPRING SUMMER
RUNOFF.
Upper Missouri January 1, 2011 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 174 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 135 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 37 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 152 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE TO BELOW AVERAGE
RANGE; 100 AND 112 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS ABOVE AVERAGE
ON JANUARY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
120 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 121, 110, AND 106 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
79 AND 106 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION DURING DECEMBER WAS NEAR OR ABOVE AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 111 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 109 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 112 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 175 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 84 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 108 PERCENT OF AVERAGE PRECIPITATION.
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 114 PERCENT OF AVERAGE. STREAM FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS FORECAST TO BE ABOUT 103 PERCENT OF AVERAGE. FLOW IN THE TONGUE BASIN IS EXPECTED TO BE 80 PERCENT OF AVERAGE. FLOWS IN THE POWDER RIVER ARE EXPECTED TO BE ABOUT 78 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 93 PERCENT OF AVERAGE. STORED WATER IN BUFFALO BILL RESERVOIR WAS 108 PERCENT OF AVERAGE. MONTHEND STORAGE WAS 98 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone January 1, 2011 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
143 PERCENT OF AVERAGE ON JANUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 125 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 122 PERCENT OF AVERAGE.
DECEMBER PRECIPITATION ACROSS THE PLATTE BASIN WAS BELOW ABOVE TO
ABOVE AVERAGE. PRECIPITATION DURING DECEMBER IN THE NORTH PLATTE
BASIN ABOVE SEMINOE RESERVOIR WAS 199 PERCENT OF AVERAGE. IN THE
NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR
PRECIPITATION WAS 199 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN
BELOW GUERNSY RESERVOIR HAD 140 PERCENT OF AVERAGE PRECIPITATION.
THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 81 PERCENT OF
AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD 68 PERCENT OF AVERAGE
DECEMBER PRECIPITATION.
December 2010 Platte Mean Precip Oct-Dec WY2011 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO RANGE FROM BELOW
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 95 TO 145 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 97 PERCENT OF AVERAGE
ON JANUARY 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 128
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
