February 1, 2010 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 BELOW AVERAGE. THE SNOW PACK ABOVE
TOSTON, MONTANA WAS 77 PERCENT OF AVERAGE. THE SNOW PACK
BETWEEN TOSTON AND FORT PECK, MONTANA WAS 83 PERCENT. THE
SNOW PACK IN THE ST MARY AND MILK RIVER BASINS WAS 79 PERCENT.
JANUARY PRECIPITATION WAS MAINLY AVERAGE TO ABOVE AVERAGE ACROSS
THE UPPER MISSOURI BASIN WITH THE EXCEPTION OF MILK-ST. MARY BASIN
WHICH WAS BELOW AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE
MISSOURI BASIN INCLUDE: MILK ST. MARY, 59 PERCENT; MILK CANADA,
170 PERCENT; LOWER MILK, 166 PERCENT; ABOVE TOSTON, 82 PERCENT;
TOSTON TO FT. PECK, 153 PERCENT.
January 2010 Upper Missouri Mean Precip Oct-Jan WY2010 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE BELOW
AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST. MARY RIVER
IS FORECAST TO HAVE 84 PERCENT OF AVERAGE APRIL-SEPTEMBER FLOWS.
RUNOFF IS EXPECTED TO RANGE AROUND 65 PERCENT OF AVERAGE FOR THE
MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE MILK
RIVER BASIN CALL FOR AROUND 75 PERCENT OF AVERAGE SPRING SUMMER RUNOFF.
Upper Missouri February 1, 2010 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 121 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 109 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 51 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 75 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE RANGE; 101 AND 87 PERCENT
OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS AVERAGE
TO BELOW AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE UPPER
YELLOWSTONE BASIN WAS 73 PERCENT OF AVERAGE. THE SNOW PACKS IN THE
WIND, BIGHORN, AND SHOSHONE BASINS WERE 69, 69, AND 63 PERCENT OF
AVERAGE, RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER
BASINS WERE 82 AND 81 PERCENT OF AVERAGE, RESPECTIVELY.
DURING JANUARY THE UPPER YELLOWSTONE RIVER BASIN RECEIVED 73 PERCENT
OF AVERAGE PRECIPITATION WHILE THE LOWER YELLOWSTONE BASIN REPORTED
127 PERCENT OF AVERAGE. THE BIGHORN BASIN RECEIVED 84 PERCENT OF
AVERAGE PRECIPITATION WHILE THE WIND RIVER BASIN RECEIVED 62 PERCENT
OF AVERAGE. THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED
76 PERCENT OF AVERAGE AND THE POWDER RIVER HAD 52 PERCENT OF
AVERAGE PRECIPITATION.
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS IN THE BELOW AVERAGE RANGE FOR THE UPCOMING SPRING AND SUMMER. RUNOFF AT BILLINGS, MONTANA IS EXPECTED TO BE 58 PERCENT OF AVERAGE, WITH A PROBABLE RANGE BETWEEN 35 AND 81 PERCENT OF AVERAGE. STREAM FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS FORECAST TO BE ABOUT 41 PERCENT OF AVERAGE WITH A PROBABLE RANGE OF 16 TO 80 PERCENT OF AVERAGE FLOW. FLOW IN THE TONGUE BASIN IS EXPECTED TO BE 63 PERCENT OF AVERAGE WITH A REASONABLY LIKELY RANGE OF 25 TO 108 PERCENT OF AVERAGE FLOW. FLOWS IN THE POWDER RIVER ARE EXPECTED TO BE ABOUT 50 PERCENT OF AVERAGE WITH A REASONABLY LIKELY RANGE OF 20 TO 100 PERCENT OF AVERAGE.
Yellowstone February 1, 2010 Spring and Summer Streamflow Forecasts
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 96 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 106 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 107 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
84 PERCENT OF AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 84 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 80 PERCENT OF AVERAGE.
JANUARY PRECIPITATION ACROSS THE PLATTE BASIN WAS BELOW AVERAGE.
PRECIPITATION IN JANUARY IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 61 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN
BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS
31 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY
RESERVOIR HAD 18 PERCENT OF AVERAGE PRECIPITATION. THE HIGH
ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 58 PERCENT OF AVERAGE
PRECIPITATION WHEREAS THE PLAINS HAD 20 PERCENT OF AVERAGE
JANUARY PRECIPITATION.
January 2010 Platte Mean Precip Oct-Jan WY2010 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
75 TO 95 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE 40 TO 100 PERCENT OF
AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE,
COLORADO CAN EXPECT 70 TO 80 PERCENT OF AVERAGE FLOW. FOR THE
REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED TO
BE ABOUT 75 TO 90 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 101 PERCENT OF AVERAGE
ON FEBRUARY 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
