June 1, 2015 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 52 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 33 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 59 PERCENT.
MAY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS BELOW TO NEAR
AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 72 PERCENT; MILK CANADA, 68 PERCENT;
LOWER MILK, 73 PERCENT; ABOVE TOSTON, 116 PERCENT; TOSTON TO
FT. PECK, 111 PERCENT.
May 2015 Upper Missouri Mean Precip Oct-May WY2015 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE
BELOW AVERAGE DURING THIS SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 56 PERCENT OF AVERAGE JUNE-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 48 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA.
Upper Missouri June 1, 2015 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 104 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 86 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 110 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 106 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; 106 AND 115 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS BELOW AVERAGE
ON JUNE 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
56 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 121, 61, AND 48 PERCENT OF AVERAGE,
RESPECTIVELY.
PRECIPITATION DURING MAY WAS ABOVE AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 131 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 102 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 169 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 240 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 180 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 176 PERCENT OF AVERAGE PRECIPITATION.
May 2015 Yellowstone Mean Precip Oct-May WY2015 Yellowstone Mean Precip
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS BELOW
AVERAGE FOR THIS SPRING AND SUMMER. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE ABOUT 80 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 88 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 100 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 137 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 147 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 112 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone June 1, 2015 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS 115 PERCENT OF AVERAGE ON JUNE 1. THE SNOW PACK IN THE NORTH PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 104 PERCENT OF AVERAGE. THE SNOWPACK IN THE SOUTH PLATTE BASIN WAS 185 PERCENT OF AVERAGE. MAY PRECIPITATION ACROSS THE PLATTE BASIN WAS ABOVE AVERAGE. PRECIPITATION DURING MAY IN THE NORTH PLATTE BASIN ABOVE SEMINOE RESERVOIR WAS 187 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 196 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 239 PERCENT OF AVERAGE PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 258 PERCENT OF AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD 273 PERCENT OF AVERAGE MAY PRECIPITATION.
May 2015 Platte Mean Precip Oct-May WY2015 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE BELOW TO NEAR
AVERAGE DURING THIS SPRING AND SUMMER.
RUNOFF FOR STREAMS ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE
NEAR 75 PERCENT OF AVERAGE.
STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE NEAR 70 PERCENT OF
AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 114 PERCENT OF AVERAGE
ON JUNE 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 120
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
