February 1, 2008 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 NEAR AVERAGE. THE SNOW PACK ABOVE
TOSTON, MONTANA WAS 109 PERCENT OF AVERAGE. THE SNOW PACK
BETWEEN TOSTON AND FORT PECK, MONTANA WAS 92 PERCENT. THE
SNOW PACK IN THE ST MARY AND MILK RIVER BASINS WAS 94 PERCENT.
JANUARY PRECIPITATION WAS MAINLY NEAR AVERAGE ACROSS THE UPPER
MISSOURI BASIN WITH THE EXCEPTION OF THE LOWER MILK. BASIN
PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE: MILK ST.
MARY, 111 PERCENT; MILK CANADA, 106 PERCENT; LOWER MILK, 54 PERCENT;
ABOVE TOSTON, 106 PERCENT; TOSTON TO FT. PECK, 85 PERCENT.
January 2008 Upper Missouri Mean Precip Oct-Jan WY2008 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 102 PERCENT OF AVERAGE APRIL-SEPTEMBER FLOWS.
RUNOFF IS EXPECTED TO RANGE AROUND 105 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 February 1, 2008 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR HAD 56 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 73 PERCENT OF AVERAGE WATER, GIBSON RESERVOIR HAD 46 PERCENT OF AVERAGE STORED WATER, AND FRESNO RESERVOIR HAD 62 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; 89 AND 56 PERCENT OF AVERAGE WATER, RESPECTIVELY.
AS INDICATED BY THE U.S. GEOLOGICAL LONG TERM GAGING STATIONS,
THE MARIAS RIVER NEAR SHELBY, MONTANA HAD AN ESTIMATED 67 PERCENT
OF AVERAGE RUNOFF IN JANUARY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS ABOUT
AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE
BASIN WAS 101 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND,
BIGHORN, AND SHOSHONE BASINS WERE 91, 94, AND 91 PERCENT OF
AVERAGE, RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER
BASINS WERE 97 AND 108 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION ACROSS THE YELLOWSTONE BASIN DURING THE MONTH OF
JANUARY WAS AVERAGE TO SLIGHTLY BELOW AVERAGE. THE RANGE WAS
FROM 104 PERCENT OF AVERAGE IN THE BIGHORN TONGUE RIVER BASIN
TO 71 PERCENT OF AVERAGE IN THE LOWER YELLOWSTONE BASIN. FOR
THE WATER YEAR BEGINNING IN OCTOBER, PRECIPITATION FOR
THE BASIN AS A WHOLE IS NEAR AVERAGE.
STREAM FLOW IN THE YELLOWSTONE BASIN IS FORECAST TO BE AVERAGE
DURING THE UPCOMING SPRING AND SUMMER. RUNOFF AT
BILLINGS, MONTANA IS EXPECTED TO BE 96 PERCENT OF AVERAGE, WITH
A PROBABLE RANGE BETWEEN 70 AND 122 PERCENT OF AVERAGE. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE 81 PERCENT OF AVERAGE WITH A PROBABLE RANGE
OF 53 TO 107 PERCENT OF AVERAGE FLOW IN SUB-BASINS. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 73 TO 77 PERCENT OF AVERAGE WITH
A REASONABLY LIKELY RANGE OF 38 TO 118 PERCENT OF AVERAGE FLOW.
FLOWS IN THE POWDER RIVER ARE EXPECTED TO BE ABOUT 119 PERCENT
OF AVERAGE WITH A REASONABLY LIKELY RANGE OF 78 TO 157 PERCENT.
Yellowstone February 1, 2008 Spring and Summer Streamflow Forecasts
MONTH END STORAGE WAS 65 PERCENT OF AVERAGE AT BOYSEN RESERVOIR IN
WYOMING, 108 PERCENT OF AVERAGE AT BUFFALO BILL RESERVOIR IN
WYOMING, AND 102 PERCENT OF AVERAGE AT BIGHORN RESERVOIR ON THE
WYOMING/MONTANA BORDER.
RUNOFF DURING JANUARY IN THE YELLOWSTONE RIVER WAS 69 PERCENT OF
THE 1971 TO 2000 AVERAGE AT CORWIN SPRINGS, MONTANA AND 76 PERCENT
OF THAT PERIOD`S AVERAGE AT BILLINGS, MONTANA.
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
101 PERCENT OF AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 86 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 97 PERCENT OF AVERAGE.
JANUARY PRECIPITATION ACROSS THE SOUTH PLATTE BASIN WAS AVERAGE TO
BELOW AVERAGE. JANUARY PRECIPITATION IN THE NORTH PLATTE BASIN
ABOVE SEMINOE RESERVOIR WAS 111 PERCENT OF AVERAGE. IN THE NORTH
PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR
PRECIPITATION WAS 68 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 103 PERCENT OF
AVERAGE JANUARY PRECIPITATION WHEREAS THE PLAINS HAD 31 PERCENT OF
AVERAGE PRECIPITATION.
January 2008 Platte Mean Precip Oct-Jan WY2008 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
90 TO 115 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE 65 TO 110 PERCENT OF
AVERAGE. THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE, COLORADO CAN
EXPECT ABOUT 100 PERCENT OF AVERAGE FLOW. FOR THE REMAINDER OF THE
SOUTH PLATTE BASIN FLOWS ARE EXPECTED TO BE ABOUT 90 TO 105 AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
