June 1, 2010 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF JUNE 1
WAS ABOVE AVERAGE. THE SNOW PACK ABOVE TOSTON, MONTANA WAS 120
PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON AND FORT PECK,
MONTANA WAS 131 PERCENT. THE SNOW PACK IN THE ST MARY AND MILK RIVER
BASINS WAS 103 PERCENT.
MAY PRECIPITATION WAS ABOVE AVERAGE ACROSS THE UPPER MISSOURI
BASIN. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 82 PERCENT; MILK CANADA, 162 PERCENT; LOWER
MILK, 208 PERCENT; ABOVE TOSTON, 123 PERCENT; TOSTON TO FT. PECK,
144 PERCENT.
May 2010 Upper Missouri Mean Precip Oct-May 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 90 PERCENT OF AVERAGE JUNE-SEPTEMBER FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 82 PERCENT OF AVERAGE FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE MILK RIVER BASIN CALL FOR AROUND 80 PERCENT OF AVERAGE SPRING SUMMER RUNOFF.
Upper Missouri June 1, 2010 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 116 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 105
PERCENT OF AVERAGE WATER, GIBSON RESERVOIR HAD 96 PERCENT OF
AVERAGE STORED WATER, AND FRESNO RESERVOIR HAD 124 PERCENT OF AVERAGE
STORED WATER. THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA
(CANYON FERRY AND FORT PECK) HAD MONTH END STORAGE IN THE AVERAGE
TO BELOW AVERAGE RANGE; 102 AND 88 PERCENT OF AVERAGE WATER,
RESPECTIVELY.
YELLOWSTONE BASIN
PRECIPITATION DURING THE MONTH OF MAY WAS ABOUT 183 PERCENT OF
AVERAGE IN THE WIND RIVER BASIN ABOVE BOYSEN RESERVOIR, 99 PERCENT
OF AVERAGE IN THE UPPER YELLOWSTONE BASIN, 155 PERCENT OF AVERAGE
IN THE BIGHORN BASIN, AND 186 TO 188 PERCENT OF AVERAGE IN THE LITTLE
BIGHORN BASINS-UPPER TONGUE BASINS, 188 PERCENT OF AVERAGE IN THE
POWDER RIVER BASIN, AND 206 PERCENT OF AVERAGE IN THE LOWER
YELLOWSTONE BASIN.
STREAM FLOW IN MOST OF THE YELLOWSTONE BASIN IS FORECAST TO BE
BELOW AVERAGE DURING THE UPCOMING SUMMER. RUNOFF AT BILLINGS,
MONTANA IS EXPECTED TO BE 72 PERCENT OF AVERAGE. RUNOFF IN
THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS FORECAST
TO BE ABOUT 95 PERCENT OF AVERAGE. THE POWDER RIVER IS EXPECTED TO
BE NEAR 120 PERCENT OF AVERAGE
MONTHEND STORAGE WAS 95 PERCENT OF AVERAGE AT BOYSEN RESERVOIR
IN WYOMING, 98 PERCENT OF AVERAGE AT BUFFALO BILL RESERVOIR IN
WYOMING, AND 111 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON THE
WYOMING/MONTANA BORDER.
STREAMFLOW ON JUNE 1 IN THE YELLOWSTONE RIVER WAS NEAR AVERAGE AT
CORWIN SPRINGS AND BELOW AVERAGE AT BILLINGS. BY JUNE 10 THE FLOWS
AT BOTH OF THESE LOCATIONS WERE ABOVE AVERAGE.
Yellowstone June 1, 2010 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS 108
PERCENT OF AVERAGE ON JUNE 1. THE SNOW PACK IN THE NORTH PLATTE
BASIN BELOW SEMINOE RESERVOIR WAS 156 PERCENT OF AVERAGE. THE SNOW
PACK IN THE SOUTH PLATTE BASIN WAS 78 PERCENT OF AVERAGE.
MAY PRECIPITATION WAS BELOW AVERAGE IN THE SOUTH PLATTE BASIN BUT
ABOVE AVERAGE IN THE NORTH PLATTE BASIN WAS ABOVE AVERAGE.
PRECIPITATION IN MAY IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 127 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN
BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS
116 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY
RESERVOIR HAD 148 PERCENT OF AVERAGE PRECIPITATION. THE HIGH
ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 74 PERCENT OF AVERAGE
PRECIPITATION WHEREAS THE PLAINS HAD 79 PERCENT OF AVERAGE MARCH
PRECIPITATION.
May 2010 Platte Mean Precip Oct-May WY2010 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO ABOVE AVERAGE TO BELOW
AVERAGE DURING THE UPCOMING SPRING AND SUMMER. RUNOFF FOR STREAMS
ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE ABOUT 110 TO 124 PERCENT
OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE BELOW SEMINOE
RESERVOIR ARE FORECAST TO BE 120 TO 160 PERCENT OF AVERAGE. STREAMS
IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE, COLORADO CAN EXPECT
ABOUT 85 PERCENT OF AVERAGE FLOW. FOR THE REMAINDER OF THE SOUTH
PLATTE BASIN FLOWS ARE EXPECTED TO BE ABOUT 70 TO 95 PERCENT OF
AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 108 PERCENT OF AVERAGE ON
MAY 1. RESERVOIRS IN THE NORTH PLATTE BASIN WERE HOLDING
131 PERCENT OF AVERAGE WATER.
North Platte Streamflow Fcst South Platte Streamflow Fcst
