National Weather Service United States Department of Commerce

Missouri Basin River Forecast Center
Water Supply Statement
Issued in cooperation with the Natural
Resources Conservation Service
Issued:  January 20, 2024

 

                                                        January 1, 2024 Spring and Summer Streamflow Forecasts

 

 Upper Missouri Basin


The high elevation snow pack in the Upper Missouri Basin as of January 1
was below ave
rage.  The snow pack in the St. Mary Basin was 51 percent,
and the Milk River Basin was 55 percent.

December precipitation across the Upper Missouri Basin was below average.
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
87 percent; Milk Canada, 29 percent; Lower Milk, 28 percent; above Toston,
50 percent; Toston to Ft. Peck, 29 percent. 

 

December 2023 Upper Missouri Mean Precip                                  Oct-Dec WY2024 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 48 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 January 1, 2024 Spring and Summer Streamflow Forecasts

 

Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 144 percent average storage, Clark Canyon was
holding 151 percent of average water, Gibson Reservoir had 29
percent of average stored water, and Fresno Reservoir had
43 percent of average stored water.



Yellowstone Basin 

The high elevation snow pack in the Yellowstone Basin was below average
on January 1. The snow pack in the Upper Yellowstone Basin was 55 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 83,
75, and 77 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 59 and 51 percent of average, respectively.

Precipitation during December was below average. The upper Yellowstone
River Basin received 36 percent of average precipitation while the
Lower Yellowstone River Basin reported 46 percent of average. The
Bighorn Basin received 42 percent of average precipitation while the
Wind River Basin received 50 percent of average. The Little Bighorn -
Upper Tongue Basin received 32 percent of average, and the Powder River
had 30 percent of average precipitation.




 December 2023 Yellowstone Mean Precip                                        Oct-Dec WY2024 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 
88 percent of average.  Flow in the Tongue Basin is expected to be
83 percent of average.  Flows in the Powder River are expected
to be about 75 percent of average.

Monthend storage at Boysen Reservoir was 108 percent of average. 
Stored water in Buffalo Bill Reservoir was 106 percent of average. 
Monthend storage was 102 percent of average at Bighorn Reservoir.

 


    Yellowstone January 1, 2024 Spring and Summer Streamflow Forecasts

 

Platte Basin 

The high elevation snow pack in the Upper North Platte Basin was
73 percent of average on January 1.  The snow pack in the North Platte
Basin below Seminoe Reservoir was 74 percent of average.  The snow
pack in the South Platte Basin was 72 percent of average.

Precipitation during December in the Upper North Platte Basin was 80
percent of average.  In the Lower North Platte Basin, precipitation
was 38 percent of average.  The North Platte Plains below Guernsy
Reservoir had 30 percent.  The South Platte Mountains had 106
percent whereas the Plains had 80 percent of average December
precipitation.





 

 December 2023 Platte Mean Precip                                            Oct-Dec WY2024 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 72 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 76 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 78 percent.

Stored water in the South Platte Basin was 112 percent of average
on January 1.



   North Platte Streamflow Fcst                     South Platte Streamflow Fcst


PRECIPITATION MAPS
December 2023  WY 2024
December 2023 Precipitation Percent of 1991-2020 Average WY2024 Precipitation as Percent of 1991-2020 Average
December 2023 Basin Mean Precipitation          WY2024 Basin Mean Precipitation
December 2023 MBRFC Basin Mean Precipitation      WY2024 MBRFC Basin Mean Precipitation

 

WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI

1413 CST WEDNESDAY JANUARY 03, 2024

DATA CURRENT AS OF: JANUARY 01, 2024

MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS


                                          50%   %   10%   90%   AVG
FORECAST POINT                   PERIOD  (KAF) AVG (KAF) (KAF) (KAF)
--------------------------------------------------------------------

Boysen Resvr Inflow              Apr-Sep  702   98  1321  394    720
 SBDW4

Boysen Resvr Inflow              Apr-Sep 1220  137  1896  816    890
 SBDW4N

Bighorn R at Kane                Apr-Sep 1362  138  2165  791    985
 LVEW4

Bighorn R at Kane                Apr-Sep 2080  144  2980 1400   1440
 LVEW4N

Greybull R at Meeteetse          Apr-Sep  282  144   391  165    196
 MEEW4

Greybull R at Meeteetse          Apr-Sep  282  138   391  165    205
 MEEW4N

Buffalo Bill Resvr Inflow        Apr-Sep  635   78   990  438    815
 CDYW4

Buffalo Bill Resvr Inflow        Apr-Sep  731   80  1084  513    910
 CDYW4N

Keyhole Resvr Inflow             Apr-Sep    6  150    17    2      4
 KEYW4

St. Mary R nr Babb               Apr-Sep  286   62   397  231    460
 SMYM8

St. Mary R nr Babb               Apr-Sep  275   51   387  220    535
 SMYM8N

St. Mary R at Intl Boundary      Apr-Sep  193   49   329  130    390
 SMBM8

St. Mary R at Intl Boundary      Apr-Sep  317   48   450  256    660
 SMBM8N

Milk R nr Western Crossing       Apr-Sep   11   10    32    5    113
 PDBM8

Milk R nr Western Crossing       Apr-Sep   15   37    45    6     41
 PDBM8N

Milk R nr Eastern Crossing       Apr-Sep  150   70   217  140    215
 ERNM8

Milk R nr Eastern Crossing       Apr-Sep   46   41   143   27    112
 ERNM8N

North Platte R nr Northgate      Apr-Sep  272  111   480  106    245
 NGTC2

North Platte R nr Northgate      Apr-Sep  323  109   532  145    295
 NGTC2N

Encampment R nr Encampment       Apr-Sep   86   55   134   43    156
 ECRW4

Encampment R nr Encampment       Apr-Sep   97   58   144   54    166
 ECRW4N

Rock Cr nr Arlington             Apr-Sep   38   72    54   24     53
 KCRW4

Rock Cr nr Arlington             Apr-Sep   38   72    55   25     53
 KCRW4N

Seminoe Resvr Inflow             Apr-Sep  637   83   926  248    765
 SETW4

Seminoe Resvr Inflow             Apr-Sep  791   86  1086  374    920
 SETW4N

Laramie R nr Woods Landing       Apr-Sep   43   40   107   16    108
 WODW4

Laramie R nr Woods Landing       Apr-Sep   79   56   142   42    142
 WODW4N

Little Laramie R nr Filmore      Apr-Sep   39   71    75   22     55
 SMTW4

Little Laramie R nr Filmore      Apr-Sep   41   72    77   24     57
 SMTW4N

Antero Resvr Inflow              Apr-Sep   12   86    20    7     14
 ANRC2

Antero Resvr Inflow              Apr-Sep   12   86    20    7     14
 ANRC2N

Spinney Mountain Resvr Inflow    Apr-Sep   45   79    88   30     57
 SPYC2

Spinney Mountain Resvr Inflow    Apr-Sep   35   78    77   17     45
 SPYC2N

Elevenmile Canyon Resvr Inflow   Apr-Sep   41   69    80   33     59
 EVNC2

Elevenmile Canyon Resvr Inflow   Apr-Sep   40   80    85   19     50
 EVNC2N

Cheesman Lk Inflow               Apr-Sep   68   68   138   46    100
 CHEC2

Cheesman Lk Inflow               Apr-Sep   71   76   148   41     93
 CHEC2N

S Platte R at S Platte           Apr-Sep  323  135   424  296    240
 SPTC2

S Platte R at S Platte           Apr-Sep  136   66   242   72    205
 SPTC2N

Bear Cr at Morrison              Apr-Sep   15   58    30    7     26
 MRRC2

Bear Cr at Morrison              Apr-Sep   15   58    30    7     26
 MRRC2N

Clear Cr at Golden               Apr-Sep   76   64   115   41    118
 GLDC2

Clear Cr at Golden               Apr-Sep   87   66   129   48    131
 GLDC2N

St. Vrain Cr at Lyons            Apr-Sep   53   67    84   33     79
 LNSC2

St. Vrain Cr at Lyons            Apr-Sep   77   71   116   50    109
 LNSC2N

Boulder Cr nr Orodell            Apr-Sep   31   66    51   22     47
 OROC2

Boulder Cr nr Orodell            Apr-Sep   46   88    68   32     52
 OROC2N

S Boulder Cr nr Eldorado Sprgs   Apr-Sep   30   86    40   16     35
 BELC2

S Boulder Cr nr Eldorado Sprgs   Apr-Sep   31   78    48   16     40
 BELC2N

Cache La Poudre at Canyon Mouth  Apr-Sep  156  144   253   77    108
 FTDC2

Cache La Poudre at Canyon Mouth  Apr-Sep  187   89   290   91    210
 FTDC2N

Lima Resvr Inflow                Apr-Sep   60   79    95   24     76
 LRRM8

Lima Resvr Inflow                Apr-Sep   60   76    95   24     79
 LRRM8N

Clark Canyon Resvr Inflow        Apr-Sep   73   66   127   51    110
 CLKM8

Clark Canyon Resvr Inflow        Apr-Sep  129   65   193   72    198
 CLKM8N

Beaverhead R at Barretts         Apr-Sep  166   83   205  145    199
 BARM8

Beaverhead R at Barretts         Apr-Sep  164   59   237   98    280
 BARM8N

Ruby R Resvr Inflow              Apr-Sep   86   98   100   62     88
 ALRM8

Ruby R Resvr Inflow              Apr-Sep   86   89   100   62     97
 ALRM8N

Big Hole R nr Melrose            Apr-Sep  343   58   506  191    595
 MLRM8

Big Hole R nr Melrose            Apr-Sep  408   62   573  259    660
 MLRM8N

Hebgen Resvr Inflow              Apr-Sep  424   91   537  298    465
 HBDM8

Hebgen Resvr Inflow              Apr-Sep  424   91   537  298    465
 HBDM8N

Ennis Resvr Inflow               Apr-Sep  667   93   797  493    715
 ELMM8

Ennis Resvr Inflow               Apr-Sep  712   98   874  494    730
 ELMM8N

Gallatin R nr Gateway            Apr-Sep  191   40   252  147    475
 GLGM8

Gallatin R nr Gateway            Apr-Sep  191   40   252  147    475
 GLGM8N

Gallatin R at Logan              Apr-Sep  198   39   295  127    505
 LOGM8

Gallatin R at Logan              Apr-Sep  329   51   425  218    650
 LOGM8N

Missouri R at Toston             Apr-Sep 1382   67  1955  825   2060
 TOSM8

Missouri R at Toston             Apr-Sep 2040   72  2702 1380   2830
 TOSM8N

Missouri R at Fort Benton        Apr-Sep 1846   60  2130 1648   3060
 FBNM8

Missouri R at Fort Benton        Apr-Sep 2980   73  3811 2096   4100
 FBNM8N

Missouri R nr Virgelle           Apr-Sep 1963   57  2325 1738   3420
 VRGM8

Missouri R nr Virgelle           Apr-Sep 3362   74  4324 2348   4560
 VRGM8N

Missouri R nr Landusky           Apr-Sep 2133   58  2575 1853   3680
 LDKM8

Missouri R nr Landusky           Apr-Sep 3624   74  4618 2511   4890
 LDKM8N

Missouri R below Fort Peck Dam   Apr-Sep 2438   63  2862 2030   3840
 FPKM8

Missouri R below Fort Peck Dam   Apr-Sep 3951   76  4956 2732   5180
 FPKM8N

Gibson Resvr Inflow              Apr-Sep  205   46   402  125    450
 AGSM8

Gibson Resvr Inflow              Apr-Sep  205   46   402  125    450
 AGSM8N

Marias R nr Shelby               Apr-Sep  203   47   470  110    435
 SHLM8

Marias R nr Shelby               Apr-Sep  247   50   523  137    490
 SHLM8N

Musselshell R at Harlowton       Apr-Sep   98  122   171   68     80
 HLWM8

Musselshell R at Harlowton       Apr-Sep  114  120   185   82     95
 HLWM8N

Yellowstone R at Yellowstone Lk  Apr-Sep  713   87   886  509    815
 YLOW4

Yellowstone R at Yellowstone Lk  Apr-Sep  899  107  1126  625    840
 YLOW4N

Yellowstone R at Corwin Sprgs    Apr-Sep 1648   83  2061 1146   1980
 CORM8

Yellowstone R at Corwin Sprgs    Apr-Sep 1912   92  2403 1342   2070
 CORM8N

Yellowstone R at Livingston      Apr-Sep 1904   83  2329 1351   2290
 LIVM8

Yellowstone R at Livingston      Apr-Sep 2226   91  2749 1598   2440
 LIVM8N

Yellowstone R at Billings        Apr-Sep 2972   73  4000 2081   4070
 BILM8

Yellowstone R at Billings        Apr-Sep 3941   82  5089 2984   4790
 BILM8N

Yellowstone R at Miles City      Apr-Sep 4950   85  8043 3499   5850
 MILM8

Yellowstone R at Miles City      Apr-Sep 7307   95 10459 5533   7690
 MILM8N

Yellowstone R at Sidney          Apr-Sep 5023   88  8187 3455   5710
 SIDM8

Yellowstone R at Sidney          Apr-Sep 7679   95 10954 5723   8060
 SIDM8N

Boulder R at Big Timber          Apr-Sep  203   61   267  140    335
 BTMM8

Boulder R at Big Timber          Apr-Sep  244   65   309  181    375
 BTMM8N

Stillwater R nr Absarokee        Apr-Sep  451   84   576  320    540
 SRAM8

Stillwater R nr Absarokee        Apr-Sep  504   85   632  379    595
 SRAM8N

Clks Fk Yellowstone R nr Belfry  Apr-Sep  447   72   674  323    620
 BFYM8

Clks Fk Yellowstone R nr Belfry  Apr-Sep  517   74   746  397    695
 BFYM8N

Bighorn R nr St. Xavier          Apr-Sep 1569  110  2478 1028   1430
 STXM8

Bighorn R nr St. Xavier          Apr-Sep 2909  118  4047 2163   2460
 STXM8N

Little Bighorn R nr Hardin       Apr-Sep  109   86   298   71    127
 HRDM8

Little Bighorn R nr Hardin       Apr-Sep  109   86   298   71    127
 HRDM8N

Tongue R nr Dayton               Apr-Sep   74   77    98   45     96
 DAYW4

Tongue R nr Dayton               Apr-Sep   79   78   104   51    101
 DAYW4N

Tongue R nr Decker               Apr-Sep  161   69   266   72    235
 DSLM8

Tongue R nr Decker               Apr-Sep  209   87   316  117    240
 DSLM8N

Tongue R Resvr Inflow            Apr-Sep  164   70   276   73    235
 DKRM8

Tongue R Resvr Inflow            Apr-Sep  213   87   326  118    245
 DKRM8N

Powder R at Moorhead             Apr-Sep  160   71   345   60    225
 MHDM8

Powder R at Moorhead             Apr-Sep  208   77   390   96    270
 MHDM8N

Powder R nr Locate               Apr-Sep  167   64   391   64    260
 LOCM8

Powder R nr Locate               Apr-Sep  223   73   451  100    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