March 1, 2023 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of March 1
was near to above average. The snow pack in the St. Mary Basin was 89 percent,
and the Milk River Basin was 167 percent.
February precipitation across the Upper Missouri Basin was above average.
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
103 percent; Milk Canada, 100 percent; Lower Milk, 124 percent; above Toston,
94 percent; Toston to Ft. Peck, 162 percent.
February 2023 Upper Missouri Mean Precip Oct-Feb 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 44 percent of average
April-September flows. Runoff is expected to range around
89 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri March 1, 2023 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 61 percent average storage, Clark Canyon was
holding 83 percent of average water, Gibson Reservoir had 35
percent of average stored water, and Fresno Reservoir had
78 percent of average stored water.
Yellowstone Basin
The high elevation snow pack in the Yellowstone Basin was above average
on March 1. The snow pack in the Upper Yellowstone Basin was 105 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 125,
114, and 100 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 115 and 117 percent of average, respectively.
Precipitation during February was above average. The upper Yellowstone
River Basin received 129 percent of average precipitation while the
Lower Yellowstone River Basin reported 158 percent of average. The
Bighorn Basin received 134 percent of average precipitation while the
Wind River Basin received 201 percent of average. The Little Bighorn -
Upper Tongue Basin received 201 percent of average and the Powder River
had 176 percent of average precipitation.
February 2023 Yellowstone Mean Precip Oct-Feb 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
80 percent of average. Flow in the Tongue Basin is expected to be
80 percent of average. Flows in the Powder River are expected
to be about 74 percent of average.
Monthend storage at Boysen Reservoir was 99 percent of average.
Stored water in Buffalo Bill Reservoir was 105 percent of average.
Monthend storage was 95 percent of average at Bighorn Reservoir.
Yellowstone March 1, 2023 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
91 percent of average on March 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 97 percent of average. The snow
pack in the South Platte Basin was 101 percent of average.
Precipitation during February in the Upper North Platte Basin was 145
percent of average. In the Lower North Platte Basin, precipitation
was 154 percent of average. The North Platte Plains below Guernsy
Reservoir had 68 percent. The South Platte Mountains had 94
percent whereas the Plains had 71 percent of average February
precipitation.
February 2023 Platte Mean Precip Oct-Feb 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 80 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 84 percent.
Stored water in the South Platte Basin was 93 percent of average
on March 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
000
FGUS63 KKRF 051618
ESPKRF
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI
0954 CST SUNDAY MARCH 05, 2023
DATA CURRENT AS OF: MARCH 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 602 84 1283 252 720
SBDW4
Boysen Resvr Inflow Apr-Sep 1063 119 1838 626 890
SBDW4N
Bighorn R at Kane Apr-Sep 1055 107 1886 633 985
LVEW4
Bighorn R at Kane Apr-Sep 1773 123 2742 1015 1440
LVEW4N
Greybull R at Meeteetse Apr-Sep 200 102 288 108 196
MEEW4
Greybull R at Meeteetse Apr-Sep 200 98 288 108 205
MEEW4N
Buffalo Bill Resvr Inflow Apr-Sep 487 60 651 356 815
CDYW4
Buffalo Bill Resvr Inflow Apr-Sep 562 62 731 428 910
CDYW4N
St. Mary R nr Babb Apr-Sep 233 51 294 191 460
SMYM8
St. Mary R nr Babb Apr-Sep 238 44 301 198 535
SMYM8N
St. Mary R at Intl Boundary Apr-Sep 143 37 239 96 390
SMBM8
St. Mary R at Intl Boundary Apr-Sep 285 43 367 236 660
SMBM8N
Milk R nr Western Crossing Apr-Sep 10 9 28 5 113
PDBM8
Milk R nr Western Crossing Apr-Sep 15 37 40 7 41
PDBM8N
Milk R nr Eastern Crossing Apr-Sep 141 66 201 128 215
ERNM8
Milk R nr Eastern Crossing Apr-Sep 30 27 132 15 112
ERNM8N
North Platte R nr Northgate Apr-Sep 379 155 559 260 245
NGTC2
North Platte R nr Northgate Apr-Sep 433 147 612 310 295
NGTC2N
Encampment R nr Encampment Apr-Sep 171 110 235 135 156
ECRW4
Encampment R nr Encampment Apr-Sep 182 110 246 147 166
ECRW4N
Rock Cr nr Arlington Apr-Sep 51 96 64 41 53
KCRW4
Rock Cr nr Arlington Apr-Sep 52 98 65 41 53
KCRW4N
Seminoe Resvr Inflow Apr-Sep 922 121 1334 697 765
SETW4
Seminoe Resvr Inflow Apr-Sep 1097 119 1517 867 920
SETW4N
Laramie R nr Woods Landing Apr-Sep 68 63 117 33 108
WODW4
Laramie R nr Woods Landing Apr-Sep 103 73 153 66 142
WODW4N
Little Laramie R nr Filmore Apr-Sep 62 113 86 45 55
SMTW4
Little Laramie R nr Filmore Apr-Sep 64 112 89 47 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 67 30 57
SPYC2
Spinney Mountain Resvr Inflow Apr-Sep 37 82 66 19 45
SPYC2N
Elevenmile Canyon Resvr Inflow Apr-Sep 37 63 48 32 59
EVNC2
Elevenmile Canyon Resvr Inflow Apr-Sep 40 80 71 21 50
EVNC2N
Cheesman Lk Inflow Apr-Sep 61 61 94 43 100
CHEC2
Cheesman Lk Inflow Apr-Sep 65 70 119 36 93
CHEC2N
S Platte R at S Platte Apr-Sep 303 126 381 285 240
SPTC2
S Platte R at S Platte Apr-Sep 135 66 224 69 205
SPTC2N
Bear Cr at Morrison Apr-Sep 14 54 30 6 26
MRRC2
Bear Cr at Morrison Apr-Sep 14 54 30 6 26
MRRC2N
Clear Cr at Golden Apr-Sep 70 59 108 48 118
GLDC2
Clear Cr at Golden Apr-Sep 81 62 121 55 131
GLDC2N
St. Vrain Cr at Lyons Apr-Sep 63 80 103 43 79
LNSC2
St. Vrain Cr at Lyons Apr-Sep 89 82 140 63 109
LNSC2N
Boulder Cr nr Orodell Apr-Sep 34 72 53 22 47
OROC2
Boulder Cr nr Orodell Apr-Sep 49 94 70 35 52
OROC2N
S Boulder Cr nr Eldorado Sprgs Apr-Sep 27 77 36 17 35
BELC2
S Boulder Cr nr Eldorado Sprgs Apr-Sep 28 70 45 17 40
BELC2N
Cache La Poudre at Canyon Mouth Apr-Sep 179 166 279 103 108
FTDC2
Cache La Poudre at Canyon Mouth Apr-Sep 219 104 328 129 210
FTDC2N
Lima Resvr Inflow Apr-Sep 69 91 110 47 76
LRRM8
Lima Resvr Inflow Apr-Sep 69 87 110 47 79
LRRM8N
Clark Canyon Resvr Inflow Apr-Sep 64 58 109 52 110
CLKM8
Clark Canyon Resvr Inflow Apr-Sep 150 76 234 114 198
CLKM8N
Beaverhead R at Barretts Apr-Sep 141 71 186 131 199
BARM8
Beaverhead R at Barretts Apr-Sep 180 64 270 143 280
BARM8N
Ruby R Resvr Inflow Apr-Sep 94 107 116 76 88
ALRM8
Ruby R Resvr Inflow Apr-Sep 94 97 116 76 97
ALRM8N
Big Hole R nr Melrose Apr-Sep 444 75 705 323 595
MLRM8
Big Hole R nr Melrose Apr-Sep 509 77 768 387 660
MLRM8N
Hebgen Resvr Inflow Apr-Sep 509 109 581 438 465
HBDM8
Hebgen Resvr Inflow Apr-Sep 509 109 581 438 465
HBDM8N
Ennis Resvr Inflow Apr-Sep 790 110 918 665 715
ELMM8
Ennis Resvr Inflow Apr-Sep 868 119 998 733 730
ELMM8N
Gallatin R nr Gateway Apr-Sep 334 70 426 287 475
GLGM8
Gallatin R nr Gateway Apr-Sep 334 70 426 287 475
GLGM8N
Gallatin R at Logan Apr-Sep 325 64 485 252 505
LOGM8
Gallatin R at Logan Apr-Sep 477 73 611 400 650
LOGM8N
Missouri R at Toston Apr-Sep 1771 86 2536 1365 2060
TOSM8
Missouri R at Toston Apr-Sep 2516 89 3265 2073 2830
TOSM8N
Missouri R at Fort Benton Apr-Sep 1960 64 2674 1684 3060
FBNM8
Missouri R at Fort Benton Apr-Sep 3632 89 4546 2969 4100
FBNM8N
Missouri R nr Virgelle Apr-Sep 2085 61 2836 1790 3420
VRGM8
Missouri R nr Virgelle Apr-Sep 4082 90 5007 3236 4560
VRGM8N
Missouri R nr Landusky Apr-Sep 2236 61 3033 1910 3680
LDKM8
Missouri R nr Landusky Apr-Sep 4324 88 5284 3402 4890
LDKM8N
Missouri R below Fort Peck Dam Apr-Sep 2406 63 3280 1999 3840
FPKM8
Missouri R below Fort Peck Dam Apr-Sep 4542 88 5695 3527 5180
FPKM8N
Gibson Resvr Inflow Apr-Sep 302 67 437 226 450
AGSM8
Gibson Resvr Inflow Apr-Sep 302 67 437 226 450
AGSM8N
Marias R nr Shelby Apr-Sep 227 52 416 162 435
SHLM8
Marias R nr Shelby Apr-Sep 278 57 465 201 490
SHLM8N
Musselshell R at Harlowton Apr-Sep 48 60 95 27 80
HLWM8
Musselshell R at Harlowton Apr-Sep 61 64 104 35 95
HLWM8N
Yellowstone R at Yellowstone Lk Apr-Sep 640 79 791 523 815
YLOW4
Yellowstone R at Yellowstone Lk Apr-Sep 793 94 967 658 840
YLOW4N
Yellowstone R at Corwin Sprgs Apr-Sep 1464 74 1751 1197 1980
CORM8
Yellowstone R at Corwin Sprgs Apr-Sep 1710 83 2022 1409 2070
CORM8N
Yellowstone R at Livingston Apr-Sep 1664 73 2037 1385 2290
LIVM8
Yellowstone R at Livingston Apr-Sep 1994 82 2362 1656 2440
LIVM8N
Yellowstone R at Billings Apr-Sep 2446 60 3123 1926 4070
BILM8
Yellowstone R at Billings Apr-Sep 3427 72 4098 2832 4790
BILM8N
Yellowstone R at Miles City Apr-Sep 3861 66 5136 3279 5850
MILM8
Yellowstone R at Miles City Apr-Sep 6264 81 7790 5201 7690
MILM8N
Yellowstone R at Sidney Apr-Sep 3974 70 5290 3117 5710
SIDM8
Yellowstone R at Sidney Apr-Sep 6587 82 8274 5386 8060
SIDM8N
Boulder R at Big Timber Apr-Sep 197 59 262 152 335
BTMM8
Boulder R at Big Timber Apr-Sep 240 64 302 193 375
BTMM8N
Stillwater R nr Absarokee Apr-Sep 356 66 442 291 540
SRAM8
Stillwater R nr Absarokee Apr-Sep 415 70 495 350 595
SRAM8N
Clks Fk Yellowstone R nr Belfry Apr-Sep 395 64 484 300 620
BFYM8
Clks Fk Yellowstone R nr Belfry Apr-Sep 467 67 555 374 695
BFYM8N
Bighorn R nr St. Xavier Apr-Sep 1183 83 2010 866 1430
STXM8
Bighorn R nr St. Xavier Apr-Sep 2492 101 3497 1628 2460
STXM8N
Little Bighorn R nr Hardin Apr-Sep 109 86 240 70 127
HRDM8
Little Bighorn R nr Hardin Apr-Sep 109 86 240 70 127
HRDM8N
Tongue R nr Dayton Apr-Sep 73 76 97 49 96
DAYW4
Tongue R nr Dayton Apr-Sep 79 78 103 54 101
DAYW4N
Tongue R nr Decker Apr-Sep 147 63 230 72 235
DSLM8
Tongue R nr Decker Apr-Sep 196 82 280 119 240
DSLM8N
Tongue R Resvr Inflow Apr-Sep 150 64 245 74 235
DKRM8
Tongue R Resvr Inflow Apr-Sep 198 81 293 121 245
DKRM8N
Powder R at Moorhead Apr-Sep 156 69 333 67 225
MHDM8
Powder R at Moorhead Apr-Sep 199 74 377 99 270
MHDM8N
Powder R nr Locate Apr-Sep 181 70 388 80 260
LOCM8
Powder R nr Locate Apr-Sep 225 74 444 115 305
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
$$
