January 1, 2023 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of January 1
was near to above average. The snow pack in the St. Mary Basin was 111 percent,
and the Milk River Basin was 159 percent.
December precipitation across the Upper Missouri Basin was above average.
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
155 percent; Milk Canada, 192 percent; Lower Milk, 206 percent; above Toston,
134 percent; Toston to Ft. Peck, 159 percent.
December 2022 Upper Missouri Mean Precip Oct-Dec WY2023 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 57 percent of average
April-September flows. Runoff is expected to range around
96 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri January 1, 2023 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 58 percent average storage, Clark Canyon was
holding 82 percent of average water, Gibson Reservoir had 41
percent of average stored water, and Fresno Reservoir had
76 percent of average stored water.
Yellowstone Basin
The high elevation snow pack in the Yellowstone Basin was near average
on January 1. The snow pack in the Upper Yellowstone Basin was 123 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 120,
98, and 103 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 81 and 80 percent of average, respectively.
Precipitation during December was above average. The upper Yellowstone
River Basin received 114 percent of average precipitation while the
Lower Yellowstone River Basin reported 187 percent of average. The
Bighorn Basin received 111 percent of average precipitation while the
Wind River Basin received 251 percent of average. The Little Bighorn -
Upper Tongue Basin received 141 percent of average, and the Powder River
had 188 percent of average precipitation.
December 2022 Yellowstone Mean Precip Oct-Dec WY2023 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
83 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 64 percent of average.
Monthend storage at Boysen Reservoir was 101 percent of average.
Stored water in Buffalo Bill Reservoir was 102 percent of average.
Monthend storage was 94 percent of average at Bighorn Reservoir.
Yellowstone January 1, 2023 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
121 percent of average on January 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 93 percent of average. The snow
pack in the South Platte Basin was 85 percent of average.
Precipitation during December in the Upper North Platte Basin was 166
percent of average. In the Lower North Platte Basin, precipitation
was 120 percent of average. The North Platte Plains below Guernsy
Reservoir had 114 percent. The South Platte Mountains had 132
percent whereas the Plains had 212 percent of average December
precipitation.
December 2022 Platte Mean Precip Oct-Dec WY2023 Platte Mean Precip
Stream flow in the Platte Basin is forecast to be below
average during the upcoming Spring and Summer. Runoff
for streams above Seminoe Reservoir are expected to be
about 98 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 81 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 90 percent.
Stored water in the South Platte Basin was 84 percent of average
on January 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI
0932 CST WEDNESDAY JANUARY 04, 2023
DATA CURRENT AS OF: JANUARY 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 599 83 1259 278 720
SBDW4
Boysen Resvr Inflow Apr-Sep 1089 122 1809 669 890
SBDW4N
Bighorn R at Kane Apr-Sep 1087 110 1887 635 985
LVEW4
Bighorn R at Kane Apr-Sep 1792 124 2685 1142 1440
LVEW4N
Greybull R at Meeteetse Apr-Sep 192 98 279 94 196
MEEW4
Greybull R at Meeteetse Apr-Sep 192 94 279 94 205
MEEW4N
Buffalo Bill Resvr Inflow Apr-Sep 563 69 906 367 815
CDYW4
Buffalo Bill Resvr Inflow Apr-Sep 650 71 1000 442 910
CDYW4N
St. Mary R nr Babb Apr-Sep 299 65 407 243 460
SMYM8
St. Mary R nr Babb Apr-Sep 308 58 418 251 535
SMYM8N
St. Mary R at Intl Boundary Apr-Sep 226 58 366 159 390
SMBM8
St. Mary R at Intl Boundary Apr-Sep 367 56 502 302 660
SMBM8N
Milk R nr Western Crossing Apr-Sep 19 17 53 8 113
PDBM8
Milk R nr Western Crossing Apr-Sep 29 71 70 14 41
PDBM8N
Milk R nr Eastern Crossing Apr-Sep 152 71 227 138 215
ERNM8
Milk R nr Eastern Crossing Apr-Sep 53 47 156 30 112
ERNM8N
North Platte R nr Northgate Apr-Sep 327 133 536 138 245
NGTC2
North Platte R nr Northgate Apr-Sep 380 129 588 185 295
NGTC2N
Encampment R nr Encampment Apr-Sep 142 91 195 93 156
ECRW4
Encampment R nr Encampment Apr-Sep 153 92 206 104 166
ECRW4N
Rock Cr nr Arlington Apr-Sep 43 81 60 29 53
KCRW4
Rock Cr nr Arlington Apr-Sep 44 83 61 30 53
KCRW4N
Seminoe Resvr Inflow Apr-Sep 860 112 1214 410 765
SETW4
Seminoe Resvr Inflow Apr-Sep 1022 111 1380 561 920
SETW4N
Laramie R nr Woods Landing Apr-Sep 73 68 142 28 108
WODW4
Laramie R nr Woods Landing Apr-Sep 108 76 177 60 142
WODW4N
Little Laramie R nr Filmore Apr-Sep 53 96 94 32 55
SMTW4
Little Laramie R nr Filmore Apr-Sep 55 96 96 34 57
SMTW4N
Antero Resvr Inflow Apr-Sep 11 79 18 6 14
ANRC2
Antero Resvr Inflow Apr-Sep 11 79 18 6 14
ANRC2N
Spinney Mountain Resvr Inflow Apr-Sep 41 72 86 30 57
SPYC2
Spinney Mountain Resvr Inflow Apr-Sep 37 82 82 17 45
SPYC2N
Elevenmile Canyon Resvr Inflow Apr-Sep 37 63 59 33 59
EVNC2
Elevenmile Canyon Resvr Inflow Apr-Sep 40 80 88 19 50
EVNC2N
Cheesman Lk Inflow Apr-Sep 70 70 122 48 100
CHEC2
Cheesman Lk Inflow Apr-Sep 77 83 157 44 93
CHEC2N
S Platte R at S Platte Apr-Sep 336 140 427 300 240
SPTC2
S Platte R at S Platte Apr-Sep 157 77 266 86 205
SPTC2N
Bear Cr at Morrison Apr-Sep 17 65 33 9 26
MRRC2
Bear Cr at Morrison Apr-Sep 17 65 33 9 26
MRRC2N
Clear Cr at Golden Apr-Sep 93 79 136 52 118
GLDC2
Clear Cr at Golden Apr-Sep 106 81 150 60 131
GLDC2N
St. Vrain Cr at Lyons Apr-Sep 73 92 104 49 79
LNSC2
St. Vrain Cr at Lyons Apr-Sep 103 94 141 70 109
LNSC2N
Boulder Cr nr Orodell Apr-Sep 38 81 59 25 47
OROC2
Boulder Cr nr Orodell Apr-Sep 53 102 77 36 52
OROC2N
S Boulder Cr nr Eldorado Sprgs Apr-Sep 37 106 48 23 35
BELC2
S Boulder Cr nr Eldorado Sprgs Apr-Sep 39 98 58 23 40
BELC2N
Cache La Poudre at Canyon Mouth Apr-Sep 197 182 302 101 108
FTDC2
Cache La Poudre at Canyon Mouth Apr-Sep 236 112 345 123 210
FTDC2N
Lima Resvr Inflow Apr-Sep 68 89 101 37 76
LRRM8
Lima Resvr Inflow Apr-Sep 68 86 101 37 79
LRRM8N
Clark Canyon Resvr Inflow Apr-Sep 62 56 104 47 110
CLKM8
Clark Canyon Resvr Inflow Apr-Sep 155 78 217 95 198
CLKM8N
Beaverhead R at Barretts Apr-Sep 155 78 196 140 199
BARM8
Beaverhead R at Barretts Apr-Sep 188 67 257 121 280
BARM8N
Ruby R Resvr Inflow Apr-Sep 92 105 113 67 88
ALRM8
Ruby R Resvr Inflow Apr-Sep 92 95 113 67 97
ALRM8N
Big Hole R nr Melrose Apr-Sep 495 83 691 314 595
MLRM8
Big Hole R nr Melrose Apr-Sep 560 85 758 384 660
MLRM8N
Hebgen Resvr Inflow Apr-Sep 522 112 650 381 465
HBDM8
Hebgen Resvr Inflow Apr-Sep 522 112 650 381 465
HBDM8N
Ennis Resvr Inflow Apr-Sep 784 110 972 610 715
ELMM8
Ennis Resvr Inflow Apr-Sep 865 118 1058 643 730
ELMM8N
Gallatin R nr Gateway Apr-Sep 381 80 469 288 475
GLGM8
Gallatin R nr Gateway Apr-Sep 381 80 469 288 475
GLGM8N
Gallatin R at Logan Apr-Sep 373 74 525 231 505
LOGM8
Gallatin R at Logan Apr-Sep 526 81 670 376 650
LOGM8N
Missouri R at Toston Apr-Sep 1957 95 2657 1240 2060
TOSM8
Missouri R at Toston Apr-Sep 2709 96 3443 1912 2830
TOSM8N
Missouri R at Fort Benton Apr-Sep 2096 68 2933 1659 3060
FBNM8
Missouri R at Fort Benton Apr-Sep 3836 94 4835 2803 4100
FBNM8N
Missouri R nr Virgelle Apr-Sep 2254 66 3180 1781 3420
VRGM8
Missouri R nr Virgelle Apr-Sep 4439 97 5528 3234 4560
VRGM8N
Missouri R nr Landusky Apr-Sep 2434 66 3397 1884 3680
LDKM8
Missouri R nr Landusky Apr-Sep 4653 95 5803 3373 4890
LDKM8N
Missouri R below Fort Peck Dam Apr-Sep 2613 68 3588 1990 3840
FPKM8
Missouri R below Fort Peck Dam Apr-Sep 4903 95 6061 3512 5180
FPKM8N
Gibson Resvr Inflow Apr-Sep 344 76 570 249 450
AGSM8
Gibson Resvr Inflow Apr-Sep 344 76 570 249 450
AGSM8N
Marias R nr Shelby Apr-Sep 336 77 641 192 435
SHLM8
Marias R nr Shelby Apr-Sep 396 81 701 237 490
SHLM8N
Musselshell R at Harlowton Apr-Sep 43 54 83 23 80
HLWM8
Musselshell R at Harlowton Apr-Sep 53 56 94 32 95
HLWM8N
Yellowstone R at Yellowstone Lk Apr-Sep 637 78 787 443 815
YLOW4
Yellowstone R at Yellowstone Lk Apr-Sep 851 101 1044 595 840
YLOW4N
Yellowstone R at Corwin Sprgs Apr-Sep 1586 80 2023 1107 1980
CORM8
Yellowstone R at Corwin Sprgs Apr-Sep 1891 91 2372 1361 2070
CORM8N
Yellowstone R at Livingston Apr-Sep 1819 79 2286 1305 2290
LIVM8
Yellowstone R at Livingston Apr-Sep 2185 90 2699 1611 2440
LIVM8N
Yellowstone R at Billings Apr-Sep 2642 65 3647 1824 4070
BILM8
Yellowstone R at Billings Apr-Sep 3632 76 4743 2732 4790
BILM8N
Yellowstone R at Miles City Apr-Sep 4102 70 7216 2984 5850
MILM8
Yellowstone R at Miles City Apr-Sep 6489 84 9698 4960 7690
MILM8N
Yellowstone R at Sidney Apr-Sep 4079 71 7317 2913 5710
SIDM8
Yellowstone R at Sidney Apr-Sep 6767 84 10410 5065 8060
SIDM8N
Boulder R at Big Timber Apr-Sep 218 65 285 148 335
BTMM8
Boulder R at Big Timber Apr-Sep 259 69 327 191 375
BTMM8N
Stillwater R nr Absarokee Apr-Sep 384 71 473 268 540
SRAM8
Stillwater R nr Absarokee Apr-Sep 438 74 532 327 595
SRAM8N
Clks Fk Yellowstone R nr Belfry Apr-Sep 416 67 642 285 620
BFYM8
Clks Fk Yellowstone R nr Belfry Apr-Sep 486 70 715 358 695
BFYM8N
Bighorn R nr St. Xavier Apr-Sep 1191 83 2070 860 1430
STXM8
Bighorn R nr St. Xavier Apr-Sep 2538 103 3640 1775 2460
STXM8N
Little Bighorn R nr Hardin Apr-Sep 93 73 272 56 127
HRDM8
Little Bighorn R nr Hardin Apr-Sep 93 73 272 56 127
HRDM8N
Tongue R nr Dayton Apr-Sep 60 62 80 41 96
DAYW4
Tongue R nr Dayton Apr-Sep 66 65 86 46 101
DAYW4N
Tongue R nr Decker Apr-Sep 123 52 204 55 235
DSLM8
Tongue R nr Decker Apr-Sep 170 71 254 98 240
DSLM8N
Tongue R Resvr Inflow Apr-Sep 126 54 215 56 235
DKRM8
Tongue R Resvr Inflow Apr-Sep 172 70 265 99 245
DKRM8N
Powder R at Moorhead Apr-Sep 128 57 309 48 225
MHDM8
Powder R at Moorhead Apr-Sep 171 63 345 73 270
MHDM8N
Powder R nr Locate Apr-Sep 152 58 415 68 260
LOCM8
Powder R nr Locate Apr-Sep 197 65 451 91 305
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
