June 1, 2009 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF JUNE 1 WAS BELOW AVERAGE. THE SNOW PACK ABOVE TOSTON, MONTANA WAS 89 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON AND FORT PECK, MONTANA WAS 79 PERCENT. THE SNOW PACK IN THE ST MARY AND MILK RIVER BASINS WAS 72 PERCENT. MAY PRECIPITATION WAS BELOW AVERAGE ACROSS THE UPPER MISSOURI BASIN. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE: MILK ST. MARY, 40 PERCENT; MILK CANADA, 45 PERCENT; LOWER MILK, 53 PERCENT; ABOVE TOSTON, 52 PERCENT; TOSTON TO FT. PECK, 36 PERCENT.
May 2009 Upper Missouri Mean Precip Oct-May WY2009 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 90 PERCENT OF AVERAGE JUNE-SEPTEMBER FLOWS.
RUNOFF IS EXPECTED TO RANGE AROUND 110 PERCENT OF AVERAGE FOR THE
MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE MILK
RIVER BASIN CALL FOR AROUND 84 PERCENT OF AVERAGE SPRING SUMMER RUNOFF.
Upper Missouri June 1, 2009 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 106 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 93 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 95 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 109 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 79 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
PRECIPITATION DURING THE MONTH OF MAY WAS BELOW AVERAGE
ACROSS THE YELLOWSTONE BASIN. PRECIPITATION IN THE UPPER YELLOWSTONE
BASIN WAS 48 PERCENTOF AVERAGE. THE WIND RIVER BASIN REPORTED 43
PERCENT OF AVERAGE MAY PRECIPITATION. THE BIGHORN BASIN RECEIVED
41 PERCENT OF AVERAGE PRECIPITATION WHILE THE LITTLE BIGHORN -
UPPER TONGUE BASIN RECEIVED 33 PERCENT OF AVERAGE. THE LOWER
YELLOWSTONE BASIN RECIVED 50 PERCENT OF AVERAGE AND THE POWDER
RIVER BASIN HAD 38 PERCENT OF AVERAGE PRECIPITATION.
STREAM FLOW IN THE YELLOWSTONE BASIN IS FORECAST TO BE AVERAGE TO
BELOW AVERAGE DURING THE UPCOMING SPRING AND SUMMER. RUNOFF FOR STREAMS ABOVE
BILLINGS, MONTANA IS FORECAST TO RANGE FROM 100 TO 110 PERCENT
OF AVERAGE. STREAM FLOW FOR THE WIND-BIGHORN BASIN ABOVE
ST. SAVIER, MONTANA IS FORECAST TO RANGE FROM 90 TO 95 PERCENT
OF AVERAGE. FLOW IN THE TONGUE BASIN IS EXPECTED TO BE 120 PERCENT
OF AVERAGE. FLOWS IN THE POWDER RIVER ARE EXPECTED TO ABOUT
80 PERCENT OF AVERAGE.
Yellowstone June 1, 2009 Spring and Summer Streamflow Forecasts
MONTHEND STORAGE WAS 102 PERCENT OF AVERAGE AT BOYSEN RESERVOIR IN
WYOMING, 165 PERCENT OF AVERAGE AT BUFFALO BILL RESERVOIR IN
WYOMING, 145 PERCENT OF AVERAGE AT TONGUE RIVER RESERVOIR IN MONTANA
AND 112 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON THE
WYOMING/MONTANA BORDER.
RUNOFF DURING MAY IN THE YELLOWSTONE RIVER WAS 98 PERCENT OF
THE 1971 TO 2000 AVERAGE AT CORWIN SPRINGS, MONTANA AND 112 PERCENT
OF THAT PERIOD`S AVERAGE AT BILLINGS, MONTANA.
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
58 PERCENT OF AVERAGE ON JUNE 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 27 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 53 PERCENT OF AVERAGE.
MAY PRECIPITATION ACROSS THE PLATTE BASIN WAS AVERAGE TO BELOW AVERAGE.
PRECIPITATION IN THE NORTH PLATTE BASIN ABOVE SEMINOE RESERVOIR
WAS 74 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN
SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 52 PERCENT
OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 58
PERCENT OF AVERAGE MAY PRECIPITATION. THE HIGH ELEVATIONS OF THE
SOUTH PLATTE BASIN HAD 105 PERCENT OF AVERAGE PRECIPITATION WHEREAS
THE PLAINS HAD 68 PERCENT OF AVERAGE PRECIPITATION.
May 2009 Platte Mean Precip Oct-May WY2009 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE BELOW
AVERAGE DURING THE UPCOMING SPRING AND SUMMER.
RUNOFF FOR STREAMS ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE ABOUT
60 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE 50 TO 90 PERCENT OF
AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE,
COLORADO CAN EXPECT 60 TO 80 PERCENT OF AVERAGE FLOW. FOR THE
REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED TO BE ABOUT
80 TO 90 PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
STORED WATER IN SOUTH PLATTE BASIN WAS 105 PERCENT OF AVERAGE ON
JUNE 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 91 PERCENT OF
AVERAGE FOR THIS TIME OF THE YEAR.
