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Brian Domonkos

406-587-6991


April 1 Snowpack Remains Above Average Statewide

 


Bozeman--On April 1, statewide mountain snowpack was 120 percent of average and 185 percent of last year, resulting in a 7 percent increase in snowpack during March, according to the Natural Resources Conservation Service. Columbia River Basin snowpack was 121 percent of average and 198 percent of last year; Missouri River Basin snowpack was 116 percent of average and 168 percent of last year; and Yellowstone River Basin was 115 percent of average and 166 percent of last year. Seasonal snowfall accumulation on April 1 for the Columbia is 96 percent; Missouri is 93 percent; and Yellowstone is 91 percent.

March 2011 experienced above average mountain precipitation. Continued tracking of storms on both sides of the Continental Divide provided for the upward trend of snow water equivalent in most major river basins.

Snow Water Content
River Basin Percent of Average Percent of Last Year March percent Change
Columbia 121 198 +7
Kootenai, Montana 126 203 +9
Flathead, Montana 129 198 +6
Upper Clark Fork 115 182 +5
Bitterroot 107 195 +4
Lower Clark Fork 123 227 +6
Missouri 116 168 +5
Missouri Headwaters 113 164 +7
 - Jefferson 110 158 +7
 - Madison 113 179 +10
 - Gallatin 116 158 +4
Missouri Mainstem 125 171 +1
 - Headwaters Mainstem 114 150 +4
 - Smith-Judith-Musselshell 122 142 -4
 - Sun-Teton-Marias 116 241 +11
 - Bearpaw Mountains 170 240 -15
St. Mary 123 204 +12
St. Mary and Milk 140 210 -4
Yellowstone 115 166 +7
Upper Yellowstone 122 182 +9
Lower Yellowstone 107 153 +4
Statewide 120 185 +7

If you encounter any problems with the files provided on this page, please contact Brian Domonkos at .

See the following text document for detailed basin snowpack information:

Basin-Wide Snowpack Summary (TXT; 64 KB)

Stream flows across Montana are forecast to be 119 percent of average. Columbia River stream flows are forecast to be 124 percent of average; St. Mary River stream flows are forecast to be 117 percent of average; Missouri River stream flows are forecast to be 118 percent of average; and Yellowstone River are forecast to be 112 percent of average.

Below are averaged streamflow forecasts, by river basin, for the period April 1 through July 31. These forecasts assume near normal spring conditions and do not account for well below average (70 percent or less) or well above average (130 percent or more) snowmelt or spring rain.

Streamflow Forecasts
River Basin April to July this Year Percent of Average April to July Last Year Percent of Average
Columbia 124 58
-- Kootenai 115 59
-- Flathead 136 68
-- Upper Clark Fork 116 56
-- Bitterroot 109 48
-- Lower Clark Fork 126 47
Missouri 118 54
-- Jefferson 106 46
-- Madison 110 62
-- Gallatin 110 71
-- Missouri Mainstem 115 52
-- Smith-Judith-Musselshell 127 66
-- Sun-Teton-Marias 117 49
-- Milk 164 53
St. Mary 117 71
Yellowstone 112 61
-- Upper Yellowstone 117 66
-- Lower Yellowstone 107 53
Statewide 119 58

NOTE: The "April to July Last Year Percent of Average" column above is what was forecast last year, NOT what actually occurred.

See the following text document for detailed basin streamflow forecast information:

Provisional Water Supply Forecasts (TXT; 24 KB)

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