February 1, 2023 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of February 1
was near to above average. The snow pack in the St. Mary Basin was 85 percent,
and the Milk River Basin was 172 percent.
January precipitation across the Upper Missouri Basin was mostly below average.
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
37 percent; Milk Canada, 35 percent; Lower Milk, 31 percent; above Toston,
139 percent; Toston to Ft. Peck, 90 percent.
January 2023 Upper Missouri Mean Precip Oct-Jan WY2023 Upper Missouri Mean Precip
Stream flow in the Upper Missouri Basin is forecast to be
below to near average during the upcoming Spring and Summer.
The St. Mary River is forecast to have 46 percent of average
April-September flows. Runoff is expected to range around
92 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri February 1, 2023 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 60 percent average storage, Clark Canyon was
holding 84 percent of average water, Gibson Reservoir had 39
percent of average stored water, and Fresno Reservoir had
75 percent of average stored water.
Yellowstone Basin
The high elevation snow pack in the Yellowstone Basin was near to below average
on February 1. The snow pack in the Upper Yellowstone Basin was 85 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 135,
108, and 94 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 108 and 114 percent of average, respectively.
Precipitation during January was above average. The upper Yellowstone
River Basin received 95 percent of average precipitation while the
Lower Yellowstone River Basin reported 60 percent of average. The
Bighorn Basin received 157 percent of average precipitation while the
Wind River Basin received 351 percent of average. The Little Bighorn -
Upper Tongue Basin received 178 percent of average and the Powder River
had 159 percent of average precipitation.
January 2023 Yellowstone Mean Precip Oct-Jan WY2023 Yellowstone Mean Precip
Forecast stream flow in the Yellowstone Basin is below to near
average for the upcoming Spring and Summer. Stream flow for the
Yellowstone River above Sidney, Montana is forecast to be about
80 percent of average. Flow in the Tongue Basin is expected to be
71 percent of average. Flows in the Powder River are expected
to be about 62 percent of average.
Monthend storage at Boysen Reservoir was 102 percent of average.
Stored water in Buffalo Bill Reservoir was 104 percent of average.
Monthend storage was 96 percent of average at Bighorn Reservoir.
Yellowstone February 1, 2023 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
117 percent of average on February 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 133 percent of average. The snow
pack in the South Platte Basin was 117 percent of average.
Precipitation during January in the Upper North Platte Basin was 262
percent of average. In the Lower North Platte Basin, precipitation
was 327 percent of average. The North Platte Plains below Guernsy
Reservoir had 404 percent. The South Platte Mountains had 149
percent whereas the Plains had 374 percent of average January
precipitation.
January 2023 Platte Mean Precip Oct-Jan WY2023 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 120 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 70 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 85 percent.
Stored water in the South Platte Basin was 86 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
1216 CST FRIDAY FEBRUARY 03, 2023
DATA CURRENT AS OF: FEBRUARY 01, 2023
MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS
50% % 10% 90% AVG
FORECAST POINT PERIOD (KAF) AVG (KAF) (KAF) (KAF)
--------------------------------------------------------------------
Boysen Resvr Inflow Apr-Sep 611 85 1294 263 720
SBDW4
Boysen Resvr Inflow Apr-Sep 1099 123 1862 641 890
SBDW4N
Bighorn R at Kane Apr-Sep 1033 105 1831 598 985
LVEW4
Bighorn R at Kane Apr-Sep 1762 122 2664 1108 1440
LVEW4N
Greybull R at Meeteetse Apr-Sep 189 96 278 92 196
MEEW4
Greybull R at Meeteetse Apr-Sep 189 92 278 92 205
MEEW4N
Buffalo Bill Resvr Inflow Apr-Sep 493 60 770 379 815
CDYW4
Buffalo Bill Resvr Inflow Apr-Sep 574 63 864 450 910
CDYW4N
St. Mary R nr Babb Apr-Sep 247 54 336 201 460
SMYM8
St. Mary R nr Babb Apr-Sep 254 47 344 208 535
SMYM8N
St. Mary R at Intl Boundary Apr-Sep 166 43 297 113 390
SMBM8
St. Mary R at Intl Boundary Apr-Sep 304 46 427 246 660
SMBM8N
Milk R nr Western Crossing Apr-Sep 10 9 30 5 113
PDBM8
Milk R nr Western Crossing Apr-Sep 15 37 42 6 41
PDBM8N
Milk R nr Eastern Crossing Apr-Sep 141 66 203 129 215
ERNM8
Milk R nr Eastern Crossing Apr-Sep 35 31 133 16 112
ERNM8N
North Platte R nr Northgate Apr-Sep 390 159 612 254 245
NGTC2
North Platte R nr Northgate Apr-Sep 444 151 664 304 295
NGTC2N
Encampment R nr Encampment Apr-Sep 161 103 213 123 156
ECRW4
Encampment R nr Encampment Apr-Sep 172 104 223 135 166
ECRW4N
Rock Cr nr Arlington Apr-Sep 49 92 65 37 53
KCRW4
Rock Cr nr Arlington Apr-Sep 49 92 65 38 53
KCRW4N
Seminoe Resvr Inflow Apr-Sep 923 121 1252 651 765
SETW4
Seminoe Resvr Inflow Apr-Sep 1088 118 1410 810 920
SETW4N
Laramie R nr Woods Landing Apr-Sep 73 68 139 37 108
WODW4
Laramie R nr Woods Landing Apr-Sep 109 77 175 68 142
WODW4N
Little Laramie R nr Filmore Apr-Sep 63 115 98 45 55
SMTW4
Little Laramie R nr Filmore Apr-Sep 65 114 100 47 57
SMTW4N
Antero Resvr Inflow Apr-Sep 10 71 17 5 14
ANRC2
Antero Resvr Inflow Apr-Sep 10 71 17 5 14
ANRC2N
Spinney Mountain Resvr Inflow Apr-Sep 39 68 76 27 57
SPYC2
Spinney Mountain Resvr Inflow Apr-Sep 33 73 74 16 45
SPYC2N
Elevenmile Canyon Resvr Inflow Apr-Sep 36 61 51 32 59
EVNC2
Elevenmile Canyon Resvr Inflow Apr-Sep 37 74 77 17 50
EVNC2N
Cheesman Lk Inflow Apr-Sep 60 60 94 42 100
CHEC2
Cheesman Lk Inflow Apr-Sep 67 72 125 36 93
CHEC2N
S Platte R at S Platte Apr-Sep 318 132 393 292 240
SPTC2
S Platte R at S Platte Apr-Sep 133 65 224 72 205
SPTC2N
Bear Cr at Morrison Apr-Sep 15 58 30 8 26
MRRC2
Bear Cr at Morrison Apr-Sep 15 58 30 8 26
MRRC2N
Clear Cr at Golden Apr-Sep 77 65 123 45 118
GLDC2
Clear Cr at Golden Apr-Sep 88 67 136 53 131
GLDC2N
St. Vrain Cr at Lyons Apr-Sep 63 80 100 41 79
LNSC2
St. Vrain Cr at Lyons Apr-Sep 89 82 137 61 109
LNSC2N
Boulder Cr nr Orodell Apr-Sep 34 72 58 23 47
OROC2
Boulder Cr nr Orodell Apr-Sep 50 96 74 33 52
OROC2N
S Boulder Cr nr Eldorado Sprgs Apr-Sep 29 83 42 15 35
BELC2
S Boulder Cr nr Eldorado Sprgs Apr-Sep 32 80 50 15 40
BELC2N
Cache La Poudre at Canyon Mouth Apr-Sep 192 178 296 107 108
FTDC2
Cache La Poudre at Canyon Mouth Apr-Sep 228 109 333 134 210
FTDC2N
Lima Resvr Inflow Apr-Sep 70 92 102 44 76
LRRM8
Lima Resvr Inflow Apr-Sep 70 89 102 44 79
LRRM8N
Clark Canyon Resvr Inflow Apr-Sep 62 56 106 48 110
CLKM8
Clark Canyon Resvr Inflow Apr-Sep 153 77 226 101 198
CLKM8N
Beaverhead R at Barretts Apr-Sep 151 76 192 138 199
BARM8
Beaverhead R at Barretts Apr-Sep 184 66 262 129 280
BARM8N
Ruby R Resvr Inflow Apr-Sep 96 109 123 74 88
ALRM8
Ruby R Resvr Inflow Apr-Sep 96 99 123 74 97
ALRM8N
Big Hole R nr Melrose Apr-Sep 480 81 659 308 595
MLRM8
Big Hole R nr Melrose Apr-Sep 546 83 729 376 660
MLRM8N
Hebgen Resvr Inflow Apr-Sep 526 113 622 424 465
HBDM8
Hebgen Resvr Inflow Apr-Sep 526 113 622 424 465
HBDM8N
Ennis Resvr Inflow Apr-Sep 798 112 954 670 715
ELMM8
Ennis Resvr Inflow Apr-Sep 876 120 1034 724 730
ELMM8N
Gallatin R nr Gateway Apr-Sep 377 79 461 306 475
GLGM8
Gallatin R nr Gateway Apr-Sep 377 79 461 306 475
GLGM8N
Gallatin R at Logan Apr-Sep 389 77 546 271 505
LOGM8
Gallatin R at Logan Apr-Sep 542 83 693 418 650
LOGM8N
Missouri R at Toston Apr-Sep 1911 93 2568 1445 2060
TOSM8
Missouri R at Toston Apr-Sep 2648 94 3440 2113 2830
TOSM8N
Missouri R at Fort Benton Apr-Sep 2026 66 2786 1676 3060
FBNM8
Missouri R at Fort Benton Apr-Sep 3800 93 4710 2963 4100
FBNM8N
Missouri R nr Virgelle Apr-Sep 2170 63 3002 1783 3420
VRGM8
Missouri R nr Virgelle Apr-Sep 4219 93 5312 3245 4560
VRGM8N
Missouri R nr Landusky Apr-Sep 2311 63 3215 1883 3680
LDKM8
Missouri R nr Landusky Apr-Sep 4430 91 5587 3398 4890
LDKM8N
Missouri R below Fort Peck Dam Apr-Sep 2500 65 3392 1977 3840
FPKM8
Missouri R below Fort Peck Dam Apr-Sep 4638 90 5839 3518 5180
FPKM8N
Gibson Resvr Inflow Apr-Sep 295 66 460 212 450
AGSM8
Gibson Resvr Inflow Apr-Sep 295 66 460 212 450
AGSM8N
Marias R nr Shelby Apr-Sep 228 52 458 147 435
SHLM8
Marias R nr Shelby Apr-Sep 274 56 514 184 490
SHLM8N
Musselshell R at Harlowton Apr-Sep 51 64 85 27 80
HLWM8
Musselshell R at Harlowton Apr-Sep 63 66 102 36 95
HLWM8N
Yellowstone R at Yellowstone Lk Apr-Sep 626 77 770 495 815
YLOW4
Yellowstone R at Yellowstone Lk Apr-Sep 821 98 968 632 840
YLOW4N
Yellowstone R at Corwin Sprgs Apr-Sep 1518 77 1833 1183 1980
CORM8
Yellowstone R at Corwin Sprgs Apr-Sep 1792 87 2125 1406 2070
CORM8N
Yellowstone R at Livingston Apr-Sep 1747 76 2080 1368 2290
LIVM8
Yellowstone R at Livingston Apr-Sep 2083 85 2430 1673 2440
LIVM8N
Yellowstone R at Billings Apr-Sep 2650 65 3091 1825 4070
BILM8
Yellowstone R at Billings Apr-Sep 3634 76 4118 2820 4790
BILM8N
Yellowstone R at Miles City Apr-Sep 3928 67 5601 3117 5850
MILM8
Yellowstone R at Miles City Apr-Sep 6408 83 8112 4986 7690
MILM8N
Yellowstone R at Sidney Apr-Sep 3968 69 5676 2978 5710
SIDM8
Yellowstone R at Sidney Apr-Sep 6668 83 8515 5108 8060
SIDM8N
Boulder R at Big Timber Apr-Sep 198 59 261 135 335
BTMM8
Boulder R at Big Timber Apr-Sep 239 64 303 177 375
BTMM8N
Stillwater R nr Absarokee Apr-Sep 369 68 479 273 540
SRAM8
Stillwater R nr Absarokee Apr-Sep 426 72 533 332 595
SRAM8N
Clks Fk Yellowstone R nr Belfry Apr-Sep 412 66 538 304 620
BFYM8
Clks Fk Yellowstone R nr Belfry Apr-Sep 485 70 610 377 695
BFYM8N
Bighorn R nr St. Xavier Apr-Sep 1230 86 1897 824 1430
STXM8
Bighorn R nr St. Xavier Apr-Sep 2466 100 3490 1729 2460
STXM8N
Little Bighorn R nr Hardin Apr-Sep 97 76 258 63 127
HRDM8
Little Bighorn R nr Hardin Apr-Sep 97 76 258 63 127
HRDM8N
Tongue R nr Dayton Apr-Sep 64 67 81 42 96
DAYW4
Tongue R nr Dayton Apr-Sep 69 68 86 47 101
DAYW4N
Tongue R nr Decker Apr-Sep 127 54 199 61 235
DSLM8
Tongue R nr Decker Apr-Sep 173 72 249 102 240
DSLM8N
Tongue R Resvr Inflow Apr-Sep 130 55 208 61 235
DKRM8
Tongue R Resvr Inflow Apr-Sep 177 72 258 102 245
DKRM8N
Powder R at Moorhead Apr-Sep 128 57 309 51 225
MHDM8
Powder R at Moorhead Apr-Sep 167 62 341 75 270
MHDM8N
Powder R nr Locate Apr-Sep 149 57 380 60 260
LOCM8
Powder R nr Locate Apr-Sep 190 62 437 83 305
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
