June 1, 2012 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
JUNE 1 WAS NEAR TO ABOVE AVERAGE. THE SNOW PACK ABOVE TOSTON,
MONTANA WAS 75 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 106 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 126 PERCENT.
MAY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS ABOVE AVERAGE
TO AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 69 PERCENT; MILK CANADA, 99 PERCENT;
LOWER MILK, 158 PERCENT; ABOVE TOSTON, 77 PERCENT; TOSTON TO
FT. PECK, 97 PERCENT.
May 2012 Upper Missouri Mean Precip Oct-May WY2012 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE
NEAR AVERAGE DURING THE SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 110 PERCENT OF AVERAGE JUNE-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 98 PERCENT OF AVERAGE SPRING SUMMER
RUNOFF.
Upper Missouri June 1, 2012 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 127 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 113 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 103 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 135 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE RANGE; 109 AND 110
PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
STREAMS IN THE WIND RIVER BASIN ARE FORECAST TO HAVE NEAR RECORD LOW FLOWS.
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS BELOW AVERAGE
ON JUNE 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 26, 63, AND 63 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE BASINS WAS
41 PERCENT OF AVERAGE.
PRECIPITATION DURING MAY WAS NEAR AVERAGE TO BELOW AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 95 PERCENT OF AVERAGE PRECIPITATION.
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 80 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 76 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 72 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 95 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 89 PERCENT OF AVERAGE PRECIPITATION.
May 2012 Yellowstone Mean Precip Oct-May WY2012 Yellowstone Mean Precip
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS AVERAGE TO
BELOW AVERAGE RANGE FOR THE SPRING AND SUMMER. RUNOFF AT
BILLINGS, MONTANA IS EXPECTED TO BE 100 PERCENT OF AVERAGE. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE ABOUT 44 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 68 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 72 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 100 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 127 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 102 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone June 1, 2012 Spring and Summer Streamflow Forecasts
Platte Basin
STREAMS IN THE NORTH AND SOUTH PLATTE BASINS ARE FORECAST TO HAVE NEAR RECORD FLOWS.
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
7 PERCENT OF AVERAGE ON JUNE 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 0 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 4 PERCENT OF AVERAGE.
MAY PRECIPITATION ACROSS THE PLATTE BASIN WAS BELOW AVERAGE.
PRECIPITATION DURING MAY IN THE NORTH PLATTE BASIN ABOVE
SEMINOE RESERVOIR WAS 49 PERCENT OF AVERAGE. IN THE
NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR
PRECIPITATION WAS 44 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN
BELOW GUERNSY RESERVOIR HAD LESS THAN 27 PERCENT OF AVERAGE PRECIPITATION.
THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 69 PERCENT OF
AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD 37 PERCENT OF AVERAGE
MAY PRECIPITATION.
May 2012 Platte Mean Precip Oct-May WY2012 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE BELOW
AVERAGE DURING THE SPRING AND SUMMER.
RUNOFF FOR STREAMS ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE ABOUT
15 TO 30 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE AROUND 20 PERCENT OF
AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE,
COLORADO CAN BE AROUND 25 TO 30 PERCENT OF AVERAGE FLOW. FOR THE
REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED VARY FROM
25 TO 30 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 95 PERCENT OF AVERAGE
ON JUNE 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 118
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
