February 1, 2025 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of February 1
was below average. The snow pack in the St. Mary Basin was 67 percent,
and the Milk River Basin was 77 percent.
January precipitation across the Upper Missouri Basin was mostly below to above
average. Basin precipitation summaries for the Missouri Basin include: Milk St.
Mary, 41 percent; Milk Canada, 129 percent; Lower Milk, 86 percent; above Toston,
131 percent; Toston to Ft. Peck, 152 percent.
January 2025 Upper Missouri Mean Precip Oct-Jan WY2025 Upper Missouri Mean Precip
Stream flow in the Upper Missouri Basin is forecast to be
below average during the upcoming Spring and Summer.
The St. Mary River is forecast to have 49 percent of average
April-September flows. Runoff is expected to range around
74 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri February 1, 2025 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 101 percent average storage, Clark Canyon was
holding 120 percent of average water, Gibson Reservoir had 21
percent of average stored water, and Fresno Reservoir had
24 percent of average stored water.
Yellowstone Basin
The high elevation snow pack in the Yellowstone Basin was below average
on February 1. The snow pack in the Upper Yellowstone Basin was 79 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 79,
81, and 67 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 95 and 81 percent of average, respectively.
Precipitation during January was above average. The upper Yellowstone
River Basin received 134 percent of average precipitation while the
Lower Yellowstone River Basin reported 126 percent of average. The
Bighorn Basin received 116 percent of average precipitation while the
Wind River Basin received 163 percent of average. The Little Bighorn -
Upper Tongue Basin received 144 percent of average and the Powder River
had 132 percent of average precipitation.
January 2025 Yellowstone Mean Precip Oct-Jan WY2025 Yellowstone Mean Precip
Forecast stream flow in the Yellowstone Basin is below average
for the upcoming Spring and Summer. Stream flow for the
Yellowstone River above Sidney, Montana is forecast to be about
66 percent of average. Flow in the Tongue Basin is expected to be
68 percent of average. Flows in the Powder River are expected
to be about 48 percent of average.
Monthend storage at Boysen Reservoir was 87 percent of average.
Stored water in Buffalo Bill Reservoir was 83 percent of average.
Monthend storage was 96 percent of average at Bighorn Reservoir.
Yellowstone February 1, 2025 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
91 percent of average on February 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 85 percent of average. The snow
pack in the South Platte Basin was 105 percent of average.
Precipitation during January in the Upper North Platte Basin was 104
percent of average. In the Lower North Platte Basin, precipitation
was 151 percent of average. The North Platte Plains below Guernsy
Reservoir had 116 percent. The South Platte Mountains had 131
percent whereas the Plains had 201 percent of average January
precipitation.
January 2025 Platte Mean Precip Oct-Jan WY2025 Platte Mean Precip
Stream flow in the Platte Basin is forecast to be near
average during the upcoming Spring and Summer. Runoff
for streams above Seminoe Reservoir are expected to be
about 70 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 79 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 89 percent.
Stored water in the South Platte Basin was 100 percent of average
on February 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI
1408 CST THURSDAY FEBRUARY 06, 2025
DATA CURRENT AS OF: FEBRUARY 01, 2025
MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS
50% % 10% 90% AVG
FORECAST POINT PERIOD (KAF) AVG (KAF) (KAF) (KAF)
--------------------------------------------------------------------
Boysen Resvr Inflow Apr-Sep 353 49 834 126 720
SBDW4
Boysen Resvr Inflow Apr-Sep 764 86 1304 394 890
SBDW4N
Bighorn R at Kane Apr-Sep 692 70 1196 412 985
LVEW4
Bighorn R at Kane Apr-Sep 1277 89 2079 722 1440
LVEW4N
Greybull R at Meeteetse Apr-Sep 137 70 221 58 196
MEEW4
Greybull R at Meeteetse Apr-Sep 137 67 221 58 205
MEEW4N
Buffalo Bill Resvr Inflow Apr-Sep 386 47 660 276 815
CDYW4
Buffalo Bill Resvr Inflow Apr-Sep 467 51 753 342 910
CDYW4N
Keyhole Resvr Inflow Apr-Sep 6 150 16 2 4
KEYW4
St. Mary R nr Babb Apr-Sep 275 60 371 231 460
SMYM8
St. Mary R nr Babb Apr-Sep 268 50 365 222 535
SMYM8N
St. Mary R at Intl Boundary Apr-Sep 192 49 328 135 390
SMBM8
St. Mary R at Intl Boundary Apr-Sep 319 48 446 261 660
SMBM8N
Milk R nr Western Crossing Apr-Sep 9 8 27 4 113
PDBM8
Milk R nr Western Crossing Apr-Sep 14 34 38 5 41
PDBM8N
Milk R nr Eastern Crossing Apr-Sep 144 67 213 134 215
ERNM8
Milk R nr Eastern Crossing Apr-Sep 34 30 137 15 112
ERNM8N
North Platte R nr Northgate Apr-Sep 174 71 360 74 245
NGTC2
North Platte R nr Northgate Apr-Sep 227 77 413 124 295
NGTC2N
Encampment R nr Encampment Apr-Sep 85 54 130 51 156
ECRW4
Encampment R nr Encampment Apr-Sep 96 58 141 63 166
ECRW4N
Rock Cr nr Arlington Apr-Sep 39 74 55 27 53
KCRW4
Rock Cr nr Arlington Apr-Sep 39 74 55 28 53
KCRW4N
Seminoe Resvr Inflow Apr-Sep 491 64 770 252 765
SETW4
Seminoe Resvr Inflow Apr-Sep 647 70 925 403 920
SETW4N
Laramie R nr Woods Landing Apr-Sep 41 38 101 21 108
WODW4
Laramie R nr Woods Landing Apr-Sep 77 54 136 45 142
WODW4N
Little Laramie R nr Filmore Apr-Sep 51 93 86 35 55
SMTW4
Little Laramie R nr Filmore Apr-Sep 53 93 88 37 57
SMTW4N
Antero Resvr Inflow Apr-Sep 14 100 22 8 14
ANRC2
Antero Resvr Inflow Apr-Sep 14 100 22 8 14
ANRC2N
Spinney Mountain Resvr Inflow Apr-Sep 44 77 84 28 57
SPYC2
Spinney Mountain Resvr Inflow Apr-Sep 39 87 79 20 45
SPYC2N
Elevenmile Canyon Resvr Inflow Apr-Sep 37 63 57 31 59
EVNC2
Elevenmile Canyon Resvr Inflow Apr-Sep 41 82 82 22 50
EVNC2N
Cheesman Lk Inflow Apr-Sep 41 41 73 27 100
CHEC2
Cheesman Lk Inflow Apr-Sep 72 77 130 41 93
CHEC2N
S Platte R at S Platte Apr-Sep 297 124 372 264 240
SPTC2
S Platte R at S Platte Apr-Sep 136 66 229 75 205
SPTC2N
Bear Cr at Morrison Apr-Sep 14 54 28 7 26
MRRC2
Bear Cr at Morrison Apr-Sep 14 54 28 7 26
MRRC2N
Clear Cr at Golden Apr-Sep 84 71 128 51 118
GLDC2
Clear Cr at Golden Apr-Sep 96 73 141 59 131
GLDC2N
St. Vrain Cr at Lyons Apr-Sep 57 72 93 36 79
LNSC2
St. Vrain Cr at Lyons Apr-Sep 82 75 127 54 109
LNSC2N
Boulder Cr nr Orodell Apr-Sep 36 77 59 25 47
OROC2
Boulder Cr nr Orodell Apr-Sep 51 98 76 34 52
OROC2N
S Boulder Cr nr Eldorado Sprgs Apr-Sep 28 80 40 14 35
BELC2
S Boulder Cr nr Eldorado Sprgs Apr-Sep 31 78 48 14 40
BELC2N
Cache La Poudre at Canyon Mouth Apr-Sep 147 136 248 88 108
FTDC2
Cache La Poudre at Canyon Mouth Apr-Sep 187 89 288 102 210
FTDC2N
Lima Resvr Inflow Apr-Sep 34 45 61 22 76
LRRM8
Lima Resvr Inflow Apr-Sep 34 43 61 22 79
LRRM8N
Clark Canyon Resvr Inflow Apr-Sep 48 44 70 37 110
CLKM8
Clark Canyon Resvr Inflow Apr-Sep 94 47 142 61 198
CLKM8N
Beaverhead R at Barretts Apr-Sep 133 67 152 123 199
BARM8
Beaverhead R at Barretts Apr-Sep 123 44 173 86 280
BARM8N
Ruby R Resvr Inflow Apr-Sep 67 76 82 51 88
ALRM8
Ruby R Resvr Inflow Apr-Sep 67 69 82 51 97
ALRM8N
Big Hole R nr Melrose Apr-Sep 325 55 488 183 595
MLRM8
Big Hole R nr Melrose Apr-Sep 389 59 557 242 660
MLRM8N
Hebgen Resvr Inflow Apr-Sep 384 83 467 298 465
HBDM8
Hebgen Resvr Inflow Apr-Sep 384 83 467 298 465
HBDM8N
Ennis Resvr Inflow Apr-Sep 622 87 724 522 715
ELMM8
Ennis Resvr Inflow Apr-Sep 668 92 805 533 730
ELMM8N
Gallatin R nr Gateway Apr-Sep 304 64 391 245 475
GLGM8
Gallatin R nr Gateway Apr-Sep 304 64 391 245 475
GLGM8N
Gallatin R at Logan Apr-Sep 332 66 461 227 505
LOGM8
Gallatin R at Logan Apr-Sep 483 74 611 376 650
LOGM8N
Missouri R at Toston Apr-Sep 1331 65 1821 950 2060
TOSM8
Missouri R at Toston Apr-Sep 1990 70 2573 1514 2830
TOSM8N
Missouri R at Fort Benton Apr-Sep 1884 62 2045 1686 3060
FBNM8
Missouri R at Fort Benton Apr-Sep 3012 73 3747 2310 4100
FBNM8N
Missouri R nr Virgelle Apr-Sep 2014 59 2245 1793 3420
VRGM8
Missouri R nr Virgelle Apr-Sep 3354 74 4288 2510 4560
VRGM8N
Missouri R nr Landusky Apr-Sep 2214 60 2509 1929 3680
LDKM8
Missouri R nr Landusky Apr-Sep 3604 74 4641 2691 4890
LDKM8N
Missouri R below Fort Peck Dam Apr-Sep 2465 64 2812 2078 3840
FPKM8
Missouri R below Fort Peck Dam Apr-Sep 3880 75 4936 2848 5180
FPKM8N
Gibson Resvr Inflow Apr-Sep 206 46 358 144 450
AGSM8
Gibson Resvr Inflow Apr-Sep 206 46 358 144 450
AGSM8N
Marias R nr Shelby Apr-Sep 184 42 385 110 435
SHLM8
Marias R nr Shelby Apr-Sep 221 45 434 137 490
SHLM8N
Musselshell R at Harlowton Apr-Sep 40 50 74 20 80
HLWM8
Musselshell R at Harlowton Apr-Sep 49 52 83 26 95
HLWM8N
Yellowstone R at Yellowstone Lk Apr-Sep 263 32 360 203 815
YLOW4
Yellowstone R at Yellowstone Lk Apr-Sep 457 54 580 331 840
YLOW4N
Yellowstone R at Corwin Sprgs Apr-Sep 1085 55 1327 832 1980
CORM8
Yellowstone R at Corwin Sprgs Apr-Sep 1319 64 1613 1000 2070
CORM8N
Yellowstone R at Livingston Apr-Sep 1275 56 1547 991 2290
LIVM8
Yellowstone R at Livingston Apr-Sep 1577 65 1896 1239 2440
LIVM8N
Yellowstone R at Billings Apr-Sep 2123 52 2529 1406 4070
BILM8
Yellowstone R at Billings Apr-Sep 3073 64 3536 2331 4790
BILM8N
Yellowstone R at Miles City Apr-Sep 3093 53 4485 2388 5850
MILM8
Yellowstone R at Miles City Apr-Sep 5140 67 7090 3915 7690
MILM8N
Yellowstone R at Sidney Apr-Sep 3044 53 4432 2174 5710
SIDM8
Yellowstone R at Sidney Apr-Sep 5328 66 7348 3999 8060
SIDM8N
Boulder R at Big Timber Apr-Sep 192 57 254 129 335
BTMM8
Boulder R at Big Timber Apr-Sep 233 62 296 171 375
BTMM8N
Stillwater R nr Absarokee Apr-Sep 270 50 373 183 540
SRAM8
Stillwater R nr Absarokee Apr-Sep 328 55 427 242 595
SRAM8N
Clks Fk Yellowstone R nr Belfry Apr-Sep 415 67 543 304 620
BFYM8
Clks Fk Yellowstone R nr Belfry Apr-Sep 488 70 614 377 695
BFYM8N
Bighorn R nr St. Xavier Apr-Sep 802 56 1082 608 1430
STXM8
Bighorn R nr St. Xavier Apr-Sep 1746 71 2710 1147 2460
STXM8N
Little Bighorn R nr Hardin Apr-Sep 97 76 279 64 127
HRDM8
Little Bighorn R nr Hardin Apr-Sep 97 76 279 64 127
HRDM8N
Tongue R nr Dayton Apr-Sep 64 67 80 41 96
DAYW4
Tongue R nr Dayton Apr-Sep 69 68 86 47 101
DAYW4N
Tongue R nr Decker Apr-Sep 116 49 175 55 235
DSLM8
Tongue R nr Decker Apr-Sep 162 68 225 95 240
DSLM8N
Tongue R Resvr Inflow Apr-Sep 117 50 183 55 235
DKRM8
Tongue R Resvr Inflow Apr-Sep 164 67 233 96 245
DKRM8N
Powder R at Moorhead Apr-Sep 98 44 235 35 225
MHDM8
Powder R at Moorhead Apr-Sep 127 47 274 47 270
MHDM8N
Powder R nr Locate Apr-Sep 116 45 277 38 260
LOCM8
Powder R nr Locate Apr-Sep 148 49 314 51 305
LOCM8N
Locations with an `N` suffix indicate natural flows excluding
stream augmentations.
KAF: Thousands of Acre-feet
%AVG: Current 50%/AVG
AVG: Average(50%) seasonal runoff voulme as simulated by the river
forecast model considering acontinuous simulation of the basin
response to historic climate data (observed precipitation and
temperatures) over the period of 1991-2020.
The 50%, 10% and 90% columns indicate the probability that the
actual volume will exceed the forecast for the valid time period.
Beginning April 1, May and June official forecasts include observed
runoff volume up to official forecast date.
For more information, please visit: www.weather.gov/mbrfc/water
