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Snowmelt Peak Streamflow Volume Forecast Table

Snowmelt peak volume flows using May 1, 2015 data. These projected flows are based strictly on snowmelt and do not account for any additional rain. Actual flows may be affected by upstream reservoir management in particular watersheds.
 

 

Columbia River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Bitterroot River near Darby 2500 to 3900 49 to 76 5,111
Blackfoot River near Bonner 3200 to 6400 44 to 89 7,221
Clark Fork River above Missoula 5500 to 10000 44 to 80 12,542
Clark Fork River at St. Regis 13000 to 29000 40 to 90 32,173
Clark Fork River below Missoula 9000 to 21000 35 to 82 25,462
Fisher River near Libby 300 to 1700 15 to 85 2,003
Little Blackfoot River near Garrison 400 to 700 45 to 79 1,115**
Lower Willow Creek Reservoir Inflow 10 to 120 5 to 65 186
Middle Fork Flathead River near West Glacier 12000 to 18500 68 to 105 17,697
Middle Fork Rock Creek near Phillipsburg 340 to 560 45 to 74 756
Nevada Creek near Helmville 30 to 170 14 to 78 217
North Fork Flathead River near Columbia Falls 10000 to 19000 56 to 105 18,010
Prospect Creek at Thompson Falls 350 to 730 31 to 64 1,219**
Swan River near Big Fork 3400 to 5300 76 to 118 4,479
Thompson River near Thompson Falls 500 to 1150 27 to 62 2,047**
Tobacco River near Eureka 650 to 1050 53 to 86 1,216
Yaak River near Troy 2000 to 4600 38 to 88 5,222

 

 

Missouri River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Badger Creek near Browning 400 to 1000 38 to 96 1,040
Big Hole River below Big Lake Creek at Wisdom 450 to 1350 36 to 107 1566**
Big Hole River near Melrose 2800 to 6000 47 to 100 5,988
Boulder River near Boulder 340 to 740 38 to 82 1,183**
Clark Canyon Reservoir Inflow  to  0 to 0 850
Cut Bank Creek near Browning 480 to 800 54 to 90 857**
Dearborn River near Craig 300 to 850 28 to 78 1,085
Gallatin River near Gateway 2400 to 3600 50 to 75 4,803
Gallatin River at Logan 1300 to 3500 27 to 71 4,896
Gibson Reservoir Inflow 2600 to 5200 46 to 92 5,662
Hyalite Reservoir Inflow 150 to 250 63 to 104 240
Jefferson River near Three Forks 200 to 3200 3 to 42 7,639
Marias River near Shelby 800 to 3200 22 to 88 3,655
Missouri River at Toston 4500 to 10500 28 to 65 16,219
Musselshell River at Harlowton 300 to 700 42 to 98 715
North Fork Musselshell River near Delpine 15 to 55 38 to 141 39
Ruby Reservoir Inflow 150 to 620 16 to 65 951
Sheep Creek near White Sulphur Springs 105 to 185 66 to 117 158
Musselshell River near Martinsdale 200 to 750 27 to 102 734
Swift Reservoir Inflow 250 to 620 46 to 115 541
Two Medicine River near Browning 950 to 1900 47 to 95 2,005
Willow Creek Reservoir Inflow 25 to 90 14 to 52 174

 

Saskatchewan River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Lake Sherburne Inflow 650 to 1150 54 to 96 1,197
St. Mary River at international boundary 2750 to 4500 66 to 107 4,188

 

Yellowstone River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1981 to 2010)
Boulder River near Big Timber 3400 to 5600 81 to 134 4,180
Clarks Fork River near Belfry 4600 to 7800 64 to 109 7,178
Cooney Reservoir Inflow 250 to 850 69 to 234 363
Little Bighorn River near Hardin 600 to 1350 51 to 116 1,166
Little Goose Creek near Big Horn Wyoming 70 to 350 22 to 111 316
West Rosebud near Roscoe 540 to 940 66 to 115 818
Powder River at Moorehead 500 to 3000 26 to 156 1,921
Shields River near Livingston 400 to 1150 27 to 78 1,482
Stillwater River near Absarokee 3600 to 6000 70 to 116 5,160
Tongue River Reservoir Inflow 1200 to 2800 51 to 120 2,339
Tongue River near Dayton Wyoming 380 to 1100 34 to 100 1,102
Yellowstone River at Billings 21000 to 35000 58 to 96 36,293
Yellowstone River at Corwin Springs 9000 to 14500 53 to 85 17,110
Yellowstone River at Lake outlet 2000 to 3400 39 to 66 5,134
Yellowstone River at Livingston 10500 to 17500 54 to 90 19,494

* Provisional data values and are subject to revision.
** Site has less than 30 years record -- average values are for period of record available.
E - Site has less than 30 years record -- average values are estimated 30 year averages.

NOTE: The low number in the flow range represents the maximum daily flow that would be expected to occur with little rainfall during the peak snowmelt period. The high number in the flow range could be expected with moderate amounts of rain about the same time as maximum snowmelt runoff is occurring.