June 1, 2011 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 238 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 330 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 169 PERCENT.
MAY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS WELL ABOVE AVERAGE.
BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN INCLUDE: MILK ST.
MARY, 111 PERCENT; MILK CANADA, 121 PERCENT; LOWER MILK, 289 PERCENT;
ABOVE TOSTON, 124 PERCENT; TOSTON TO FT. PECK, 226 PERCENT.
May 2011 Upper Missouri Mean Precip Oct-May WY2011 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE ABOVE
AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST. MARY RIVER
IS FORECAST TO HAVE 141 PERCENT OF AVERAGE JUNE-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 170 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA. FORECASTS FOR THE
MILK RIVER BASIN CALL FOR AROUND 175 TO 190 PERCENT OF AVERAGE SPRING
SUMMER RUNOFF.
Upper Missouri June 1, 2011 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 107 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 106 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 84 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 MONTHEND STORAGE IN THE AVERAGE RANGE; 85 AND 116 PERCENT
OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS ABOVE
AVERAGE ON JUNE 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN
WAS 231 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 309, 266, AND 203 PERCENT OF AVERAGE, RESPECTIVELY.
THE SNOW PACK IN THE TONGUE AND POWDER BASIN WAS 570 PERCENT OF AVERAGE.
PRECIPITATION DURING MAY WAS WELL ABOVE AVERAGE. THE UPPER YELLOWSTONE
RIVER BASIN RECEIVED 212 PERCENT OF AVERAGE PRECIPITATION WHILE THE
LOWER YELLOWSTONE BASIN REPORTED 356 PERCENT OF AVERAGE. THE BIGHORN
BASIN RECEIVED 247 PERCENT OF AVERAGE PRECIPITATION WHILE THE WIND
RIVER BASIN RECEIVED 239 PERCENT OF AVERAGE. THE LITTLE BIGHORN - UPPER
TONGUE BASIN RECEIVED 284 PERCENT OF AVERAGE AND THE POWDER RIVER HAD
299 PERCENT OF AVERAGE PRECIPITATION.
May 2011 Yellowstone Mean Precip Oct-May WY2011 Yellowstone Mean Precip
STREAM FLOW IN THE YELLOWSTONE BASIN IS FORECAST TO BE ABOVE
AVERAGE DURING THE UPCOMING SPRING AND SUMMER. RUNOFF AT
BILLINGS, MONTANA IS EXPECTED TO BE 170 PERCENT OF AVERAGE. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE 212 PERCENT OF AVERAGE. FLOW IN THE TONGUE BASIN IS
EXPECTED TO BE ABOUT 220 PERCENT OF AVERAGE. FLOWS IN THE POWDER RIVER
ARE EXPECTED TO BE ABOUT 270 PERCENT OF AVERAGE.
JUNE 1 RESERVOIR STORAGE IN WYOMING WAS 75 PERCENT OF
AVERAGE IN BOYSEN RESERVOIR AND 79 PERCENT OF AVERAGE IN BUFFALO
BILL RESERVOIR. MONTHEND STORAGE WAS 110 PERCENT OF AVERAGE IN
BIGHORN RESERVOIR ON THE WYOMING/MONTANA BORDER.
Yellowstone June 1, 2011 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
306 PERCENT OF AVERAGE ON JUNE 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 266 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 332 PERCENT OF AVERAGE.
MAY PRECIPITATION ACROSS THE PLATTE BASIN WAS ABOVE AVERAGE.
PRECIPITATION DURING MAY IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 121 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN
SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 145 PERCENT
OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 180
PERCENT OF AVERAGE PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH
PLATTE BASIN HAD 131 PERCENT OF AVERAGE PRECIPITATION WHEREAS THE PLAINS
HAD 162 PERCENT OF AVERAGE MAY PRECIPITATION.
May 2011 Platte Mean Precip Oct-May WY2011 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE ABOVE AVERAGE DURING
THE UPCOMING SPRING AND SUMMER. RUNOFF FOR STREAMS ABOVE SEMINOE
RESERVOIR ARE EXPECTED TO BE FROM 220 TO 320 PERCENT OF AVERAGE.
STREAM FLOWS FOR THE NORTH PLATTE BELOW SEMINOE RESERVOIR ARE FORECAST
TO BE 300 TO 360 PERCENT OF AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN
ABOVE SOUTH PLATTE, COLORADO WILL BE AROUND 150 PERCENT OF AVERAGE
FLOW. FOR THE REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED
VARY FROM 100 TO 210 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 97 PERCENT OF AVERAGE
ON JUNE 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 100
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
