February 1, 2012 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 AVERAGE TO BELOW AVERAGE. THE SNOW PACK ABOVE TOSTON,
MONTANA WAS 80 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 101 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 89 PERCENT.
JANUARY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS NEAR TO
BELOW AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 111 PERCENT; MILK CANADA, 79 PERCENT;
LOWER MILK, 48 PERCENT; ABOVE TOSTON, 66 PERCENT; TOSTON TO
FT. PECK, 103 PERCENT.
January 2012 Upper Missouri Mean Precip Oct-Jan WY2012 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE
NEAR AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 103 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 80 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 February 1, 2012 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 142 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 115 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 42 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 119 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; 101 AND 102 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS LOW END AVERAGE
ON FEBRUARY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
90 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 88, 93, AND 94 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
126 AND 109 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION DURING JANUARY WAS NEAR OR BELOW AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 72 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 97 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 51 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 70 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 64 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 87 PERCENT OF AVERAGE PRECIPITATION.
January 2012 Yellowstone Mean Precip Oct-Jan WY2012 Yellowstone Mean Precip
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS TYPICALLY NEAR
AVERAGE RANGE FOR THE UPCOMING SPRING AND SUMMER. RUNOFF AT
BILLINGS, MONTANA IS EXPECTED TO BE 91 PERCENT OF AVERAGE. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE ABOUT 90 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 115 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 108 PERCENT OF AVERAGE.
MONTH END STORAGE AT BOYSEN RESERVOIR WAS 105 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 108 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 104 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone February 1, 2012 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
68 PERCENT OF AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 92 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 77 PERCENT OF AVERAGE.
JANUARY PRECIPITATION ACROSS THE PLATTE BASIN RANGED FROM BELOW TO
ABOVE AVERAGE. PRECIPITATION DURING JANUARY IN THE NORTH PLATTE
BASIN ABOVE SEMINOE RESERVOIR WAS 64 PERCENT OF AVERAGE. IN THE
NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR
PRECIPITATION WAS 111 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN
BELOW GUERNSY RESERVOIR HAD 66 PERCENT OF AVERAGE PRECIPITATION.
THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 61 PERCENT OF
AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD 24 PERCENT OF AVERAGE
JANUARY PRECIPITATION.
January 2012 Platte Mean Precip Oct-Jan WY2012 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO RANGE FROM BELOW
AVERAGE TO AVERAGE DURING THE UPCOMING SPRING AND SUMMER.
RUNOFF FOR STREAMS ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE ABOUT
55 TO 70 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE ABOUT 53 PERCENT OF
AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE,
COLORADO CAN EXPECT ABOUT 70 PERCENT OF AVERAGE FLOW. FOR THE
REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED VARY FROM
75 TO 90 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 112 PERCENT OF AVERAGE
ON FEBRUARY 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 132
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
