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:  April 17, 2024

 

 

                                                        April 1, 2024 Spring and Summer Streamflow Forecasts

 

 Upper Missouri Basin


The high elevation snow pack in the Upper Missouri Basin as of April 1
was below ave
rage.  The snow pack in the St. Mary Basin was 79 percent,
and the Milk River Basin was 73 percent.

March precipitation across the Upper Missouri Basin was near to above average.  
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
90 percent; Milk Canada, 95 percent; Lower Milk, 164 percent; above Toston,
101 percent; Toston to Ft. Peck, 95 percent. 

 

March 2024 Upper Missouri Mean Precip                                  Oct-Mar 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 62 percent of average
April-September flows. Runoff is expected to range around
70 percent of average for the Missouri Basin above Fort Peck,
Montana.


 


          Upper Missouri April 1, 2024 Spring and Summer Streamflow Forecasts

 

Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 143 percent average storage, Clark Canyon was
holding 131 percent of average water, Gibson Reservoir had 42
percent of average stored water, and Fresno Reservoir had
47 percent of average stored water.



Yellowstone Basin 

The high elevation snow pack in the Yellowstone Basin was below to near average
on April 1. The snow pack in the Upper Yellowstone Basin was 78 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 111,
81, and 96 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 73 and 67 percent of average, respectively.

Precipitation during March ranged from above to below average. The
upper Yellowstone River Basin received 116 percent of average precipitation 
while the Lower Yellowstone River Basin reported 75 percent of average. The
Bighorn Basin received 95 percent of average precipitation while the
Wind River Basin received 112 percent of average. The Little Bighorn -
Upper Tongue Basin received 88 percent of average and the Powder River
had 57 percent of average precipitation.




 March 2024 Yellowstone Mean Precip                                        Oct-Mar WY2024 Yellowstone Mean Precip
 

Forecast streamflow 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 
93 percent of average.  Flow in the Tongue Basin is expected to be
72 percent of average.  Flows in the Powder River are expected
to be about 78 percent of average.

Monthend storage at Boysen Reservoir was 108 percent of average. 
Stored water in Buffalo Bill Reservoir was 112 percent of average. 
Monthend storage was 101 percent of average at Bighorn Reservoir.

 


    Yellowstone April 1, 2024 Spring and Summer Streamflow Forecasts

 

Platte Basin 

The high elevation snow pack in the Upper North Platte Basin was
103 percent of average on April 1.  The snow pack in the North Platte
Basin below Seminoe Reservoir was 101 percent of average.  The snow
pack in the South Platte Basin was 121 percent of average.

Precipitation during March in the Upper North Platte Basin was 145
percent of average.  In the Lower North Platte Basin, precipitation
was 96 percent of average.  The North Platte Plains below Guernsy
Reservoir had 106 percent.  The South Platte Mountains had 209
percent whereas the Plains had 120 percent of average March
precipitation.





 

 March 2024 Platte Mean Precip                                            Oct-Mar WY2024 Platte Mean Precip

 

Stream flow in the Platte Basin is forecast to range from  
below to above average during the upcoming Spring and Summer.
Runoff for streams above Seminoe Reservoir are expected to be
about 102 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 92 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 100 percent of average
on April 1.



   North Platte Streamflow Fcst                     South Platte Streamflow Fcst


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

 

FGUS63 KKRF 041730
ESPKRF
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI

1228 CDT THURSDAY APRIL 04, 2024

DATA CURRENT AS OF: APRIL 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  788  109  1287  465    720
 SBDW4

Boysen Resvr Inflow              Apr-Sep 1342  151  1880  985    890
 SBDW4N

Bighorn R at Kane                Apr-Sep 1142  116  1671  793    985
 LVEW4

Bighorn R at Kane                Apr-Sep 2131  148  2926 1569   1440
 LVEW4N

Greybull R at Meeteetse          Apr-Sep  294  150   446  218    196
 MEEW4

Greybull R at Meeteetse          Apr-Sep  294  143   446  218    205
 MEEW4N

Buffalo Bill Resvr Inflow        Apr-Sep  708   87   901  582    815
 CDYW4

Buffalo Bill Resvr Inflow        Apr-Sep  798   88   978  660    910
 CDYW4N

Keyhole Resvr Inflow             Apr-Sep    4  100    14    2      4
 KEYW4

St. Mary R nr Babb               Apr-Sep  353   77   406  303    460
 SMYM8

St. Mary R nr Babb               Apr-Sep  331   62   385  280    535
 SMYM8N

St. Mary R at Intl Boundary      Apr-Sep  283   73   390  220    390
 SMBM8

St. Mary R at Intl Boundary      Apr-Sep  400   61   494  341    660
 SMBM8N

Milk R nr Western Crossing       Apr-Sep   14   12    46    9    113
 PDBM8

Milk R nr Western Crossing       Apr-Sep   21   51    62   12     41
 PDBM8N

Milk R nr Eastern Crossing       Apr-Sep  150   70   223  139    215
 ERNM8

Milk R nr Eastern Crossing       Apr-Sep   45   40   162   26    112
 ERNM8N

North Platte R nr Northgate      Apr-Sep  315  129   412  231    245
 NGTC2

North Platte R nr Northgate      Apr-Sep  369  125   466  280    295
 NGTC2N

Encampment R nr Encampment       Apr-Sep  134   86   173  105    156
 ECRW4

Encampment R nr Encampment       Apr-Sep  145   87   183  117    166
 ECRW4N

Rock Cr nr Arlington             Apr-Sep   53  100    62   42     53
 KCRW4

Rock Cr nr Arlington             Apr-Sep   54  102    62   43     53
 KCRW4N

Seminoe Resvr Inflow             Apr-Sep  799  104  1036  595    765
 SETW4

Seminoe Resvr Inflow             Apr-Sep  976  106  1194  759    920
 SETW4N

Laramie R nr Woods Landing       Apr-Sep   65   60    94   35    108
 WODW4

Laramie R nr Woods Landing       Apr-Sep   99   70   129   65    142
 WODW4N

Little Laramie R nr Filmore      Apr-Sep   59  107    73   46     55
 SMTW4

Little Laramie R nr Filmore      Apr-Sep   61  107    75   48     57
 SMTW4N

Antero Resvr Inflow              Apr-Sep   13   93    20    9     14
 ANRC2

Antero Resvr Inflow              Apr-Sep   13   93    20    9     14
 ANRC2N

Spinney Mountain Resvr Inflow    Apr-Sep   58  102    85   42     57
 SPYC2

Spinney Mountain Resvr Inflow    Apr-Sep   48  107    77   32     45
 SPYC2N

Elevenmile Canyon Resvr Inflow   Apr-Sep   58   98    81   42     59
 EVNC2

Elevenmile Canyon Resvr Inflow   Apr-Sep   53  106    84   36     50
 EVNC2N

Cheesman Lk Inflow               Apr-Sep   94   94   158   62    100
 CHEC2

Cheesman Lk Inflow               Apr-Sep   95  102   162   63     93
 CHEC2N

S Platte R at S Platte           Apr-Sep  291  121   418  250    240
 SPTC2

S Platte R at S Platte           Apr-Sep  167   81   304  116    205
 SPTC2N

Bear Cr at Morrison              Apr-Sep   23   88    49   11     26
 MRRC2

Bear Cr at Morrison              Apr-Sep   23   88    49   11     26
 MRRC2N

Clear Cr at Golden               Apr-Sep   92   78   154   66    118
 GLDC2

Clear Cr at Golden               Apr-Sep  105   80   170   76    131
 GLDC2N

St. Vrain Cr at Lyons            Apr-Sep   55   70   101   43     79
 LNSC2

St. Vrain Cr at Lyons            Apr-Sep   80   73   138   65    109
 LNSC2N

Boulder Cr nr Orodell            Apr-Sep   43   91    73   31     47
 OROC2

Boulder Cr nr Orodell            Apr-Sep   58  112    89   45     52
 OROC2N

S Boulder Cr nr Eldorado Sprgs   Apr-Sep   39  111    51   29     35
 BELC2

S Boulder Cr nr Eldorado Sprgs   Apr-Sep   42  105    75   29     40
 BELC2N

Cache La Poudre at Canyon Mouth  Apr-Sep  181  168   306  118    108
 FTDC2

Cache La Poudre at Canyon Mouth  Apr-Sep  215  102   345  141    210
 FTDC2N

Lima Resvr Inflow                Apr-Sep   66   87    92   51     76
 LRRM8

Lima Resvr Inflow                Apr-Sep   66   84    92   51     79
 LRRM8N

Clark Canyon Resvr Inflow        Apr-Sep   83   75   146   68    110
 CLKM8

Clark Canyon Resvr Inflow        Apr-Sep  148   75   224  121    198
 CLKM8N

Beaverhead R at Barretts         Apr-Sep  159   80   203  146    199
 BARM8

Beaverhead R at Barretts         Apr-Sep  191   68   272  165    280
 BARM8N

Ruby R Resvr Inflow              Apr-Sep   89  101   108   78     88
 ALRM8

Ruby R Resvr Inflow              Apr-Sep   89   92   108   78     97
 ALRM8N

Big Hole R nr Melrose            Apr-Sep  310   52   471  252    595
 MLRM8

Big Hole R nr Melrose            Apr-Sep  373   57   537  316    660
 MLRM8N

Hebgen Resvr Inflow              Apr-Sep  478  103   539  414    465
 HBDM8

Hebgen Resvr Inflow              Apr-Sep  478  103   539  414    465
 HBDM8N

Ennis Resvr Inflow               Apr-Sep  697   97   825  624    715
 ELMM8

Ennis Resvr Inflow               Apr-Sep  739  101   868  650    730
 ELMM8N

Gallatin R nr Gateway            Apr-Sep  156   33   214  128    475
 GLGM8

Gallatin R nr Gateway            Apr-Sep  155   33   213  127    475
 GLGM8N

Gallatin R at Logan              Apr-Sep  161   32   257  113    505
 LOGM8

Gallatin R at Logan              Apr-Sep  270   42   363  216    650
 LOGM8N

Missouri R at Toston             Apr-Sep 1283   62  1855 1056   2060
 TOSM8

Missouri R at Toston             Apr-Sep 1940   69  2570 1694   2830
 TOSM8N

Missouri R at Fort Benton        Apr-Sep 1814   59  2057 1720   3060
 FBNM8

Missouri R at Fort Benton        Apr-Sep 2828   69  3744 2560   4100
 FBNM8N

Missouri R nr Virgelle           Apr-Sep 1958   57  2236 1848   3420
 VRGM8

Missouri R nr Virgelle           Apr-Sep 3187   70  4157 2824   4560
 VRGM8N

Missouri R nr Landusky           Apr-Sep 2136   58  2515 1980   3680
 LDKM8

Missouri R nr Landusky           Apr-Sep 3411   70  4512 3063   4890
 LDKM8N

Missouri R below Fort Peck Dam   Apr-Sep 2626   68  3077 2435   3840
 FPKM8

Missouri R below Fort Peck Dam   Apr-Sep 3985   77  5166 3586   5180
 FPKM8N

Gibson Resvr Inflow              Apr-Sep  237   53   372  175    450
 AGSM8

Gibson Resvr Inflow              Apr-Sep  237   53   372  175    450
 AGSM8N

Marias R nr Shelby               Apr-Sep  216   50   356  161    435
 SHLM8

Marias R nr Shelby               Apr-Sep  262   53   403  202    490
 SHLM8N

Musselshell R at Harlowton       Apr-Sep   78   98   128   57     80
 HLWM8

Musselshell R at Harlowton       Apr-Sep   94   99   148   72     95
 HLWM8N

Yellowstone R at Yellowstone Lk  Apr-Sep  880  108   994  769    815
 YLOW4

Yellowstone R at Yellowstone Lk  Apr-Sep 1098  131  1214  962    840
 YLOW4N

Yellowstone R at Corwin Sprgs    Apr-Sep 1708   86  2037 1470   1980
 CORM8

Yellowstone R at Corwin Sprgs    Apr-Sep 2031   98  2369 1796   2070
 CORM8N

Yellowstone R at Livingston      Apr-Sep 1929   84  2314 1661   2290
 LIVM8

Yellowstone R at Livingston      Apr-Sep 2316   95  2703 2026   2440
 LIVM8N

Yellowstone R at Billings        Apr-Sep 2930   72  3827 2468   4070
 BILM8

Yellowstone R at Billings        Apr-Sep 3978   83  4806 3474   4790
 BILM8N

Yellowstone R at Miles City      Apr-Sep 4388   75  5959 3712   5850
 MILM8

Yellowstone R at Miles City      Apr-Sep 7144   93  8680 6041   7690
 MILM8N

Yellowstone R at Sidney          Apr-Sep 4398   77  6177 3634   5710
 SIDM8

Yellowstone R at Sidney          Apr-Sep 7497   93  9194 6310   8060
 SIDM8N

Boulder R at Big Timber          Apr-Sep  140   42   222  102    335
 BTMM8

Boulder R at Big Timber          Apr-Sep  182   49   263  145    375
 BTMM8N

Stillwater R nr Absarokee        Apr-Sep  395   73   516  335    540
 SRAM8

Stillwater R nr Absarokee        Apr-Sep  452   76   569  395    595
 SRAM8N

Clks Fk Yellowstone R nr Belfry  Apr-Sep  431   70   558  358    620
 BFYM8

Clks Fk Yellowstone R nr Belfry  Apr-Sep  504   73   629  431    695
 BFYM8N

Bighorn R nr St. Xavier          Apr-Sep 1407   98  2210 1117   1430
 STXM8

Bighorn R nr St. Xavier          Apr-Sep 3072  125  4136 2388   2460
 STXM8N

Little Bighorn R nr Hardin       Apr-Sep  112   88   154   78    127
 HRDM8

Little Bighorn R nr Hardin       Apr-Sep  112   88   154   78    127
 HRDM8N

Tongue R nr Dayton               Apr-Sep   64   67    94   39     96
 DAYW4

Tongue R nr Dayton               Apr-Sep   70   69    99   45    101
 DAYW4N

Tongue R nr Decker               Apr-Sep  129   55   214   70    235
 DSLM8

Tongue R nr Decker               Apr-Sep  177   74   261  114    240
 DSLM8N

Tongue R Resvr Inflow            Apr-Sep  131   56   229   71    235
 DKRM8

Tongue R Resvr Inflow            Apr-Sep  180   73   276  115    245
 DKRM8N

Powder R at Moorhead             Apr-Sep  157   70   334   99    225
 MHDM8

Powder R at Moorhead             Apr-Sep  203   75   383  141    270
 MHDM8N

Powder R nr Locate               Apr-Sep  200   77   400  134    260
 LOCM8

Powder R nr Locate               Apr-Sep  245   80   451  177    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


$$