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Snowmelt Peak Streamflow Volume Forecast Table

2009 Snowmelt Peak Volume Flows. These are volumes for snowmelt peaks and NOT rainfall peaks that might occur after the snowmelt peaks. This information DOES NOT apply to streamflows below reservoirs.

Columbia River Basin
Watershed Peak Daily cfs Peak  as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Bitterroot River near Darby 7630 140 5,454
Blackfoot River near Bonner 9610 113 8,512
Clark Fork River above Missoula 17300 118 14,698
Clark Fork River at St. Regis 42500 118 35,987
Clark Fork River below Missoula 35300 124 28,482
Fisher River near Libby 2060 88 2,334
Little Blackfoot River near Garrison 1260 113 1,115 **
Lower Willow Creek Reservoir Inflow 190 to 300 89 to 140 214
Middle Fork Flathead River near West Glacier 18400 96 19,126
Middle Fork Rock Creek near Phillipsburg 1050 128 821
Nevada Creek near Helmville 390 130 301
North Fork Flathead River near Columbia Falls 15800 80 19,788
Prospect Creek at Thompson Falls 1300 107 1,219 **
Swan River near Big Fork 5240 106 4,929
Thompson River near Thompson Falls 1750 85 2,047 **
Tobacco River near Eureka 1010 73 1,388
Yaak River near Troy 4110 70 5,859

Missouri River Basin
Watershed Peak Daily cfs Peak as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Badger Creek near Browning 1130 67 1,691
Big Hole River below Big Lake Creek at Wisdom 1990 127 1,566 **
Big Hole River near Melrose 7970 112 7,139
Boulder River near Boulder 1480 125 1,183E
Clark Canyon Reservoir Inflow 1067 90 1,191
Cut Bank Creek near Browning 993 116  857**
Dearborn River near Craig 1680 99 1,697
Gallatin River near Gateway 5120 98 5,232
Gallatin River at Logan 5220 95 5,468
Gibson Reservoir Inflow 5684 74 7,697E
Hyalite Reservoir Inflow 200 to 325 76 to 124 262E
Jefferson River near Three Forks 9860 102 9,626E
Marias River near Shelby 4120 59 6,980
Missouri River at Toston 18000 99 18,209
Musselshell River at Harlowton 636 49 1,293
North Fork Musselshell River near Delpine 30 to 70 61 to 143 49
Ruby Reservoir Inflow 841 80 1,055
Sheep Creek near White Sulphur Springs 130 to 220 68 to 116 190
Musselshell River near Martinsdale 680 60 1,133E
Swift Reservoir Inflow 606 52 1,162E
Two Medicine River near Browning 2670 70 3,838
Willow Creek Reservoir Inflow 203 94 215

Saskatchewan River Basin
Watershed Peak Range in Daily cfs Peak Range as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Lake Sherburne Inflow 989 58 1,694
St. Mary River at international boundary 2510 60 4,188

Yellowstone River Basin
Watershed Peak Range in Daily cfs Peak Range as Percent of Average Average Daily Peak in cfs (1971 to 2000)
Boulder River near Big Timber 4140 82 5,051
Clarks Fork River near Belfry 8850 117 7,554
Cooney Reservoir Inflow 249 30 831
Little Bighorn River near Hardin 891 47 1,895
Little Goose Creek near Big Horn Wyoming 230 to 520 68 to 154 338
Mystic Lake Inflow 891 90 948
Powder River at Moorehead 1290 29 4,374
Shields River near Livingston 2020 104 1,940
Stillwater River near Absarokee 5100 83 6,129
Tongue River Reservoir Inflow 1810 57 3,199
Tongue River near Dayton Wyoming 998 99 1,006
Yellowstone River at Billings 40300 97 41,617
Yellowstone River at Corwin Springs 18700 106 17,570
Yellowstone River at Lake outlet 5100 to 7400 93 to 135 5,487
Yellowstone River at Livingston 20600 101 20,364

* 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.

Last Modified: 07/08/2009