Extended Streamflow Prediction
Issued by NWS Missouri Basin, Pleasant Hill

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FGUS63 KKRF 191959
ESPKRF
Missouri Basin River Forecast Center
Water  Supply  Statement
Issued in Cooperation with Natural Resources Conservation Service
Issued:  April 19, 2017


Upper Missouri Basin

The high elevation snow pack in the Upper Missouri Basin as of
April 1 was below to near average.  The snow pack above Fort Peck,
Montana was 89 percent of average.  The snow pack in the St Mary
basin was 108 percent, and the Milk basin was 92 percent.

March precipitation across the Upper Missouri basin was near to
above average.  Basin precipitation summaries for the Missouri
Basin include: Milk St. Mary,  174 percent; Milk Canada, 98
percent;  Lower Milk, 89 percent; Above Toston, 105 percent;
Toston to Ft. Peck, 87 percent.

Stream flow in the Upper Missouri Basin is forecast to be near
to below average during the upcoming spring and summer.  The St. Mary
River is forecast to have near 66 percent of average April-September
flows.  Runoff is expected to range around 105 percent of average
for the Missouri Basin above Fort Peck, Montana.

Of the four major irrigation reservoirs in Montana:  Lima Reservoir
had 165 percent average storage, Clark Canyon was holding 94 percent
of average water, Gibson Reservoir had 84 percent of average stored
water, and Fresno Reservoir had 148 percent of average stored water.
The  major  hydroelectric  reservoirs  in  Montana (Canyon  Ferry and
Fort Peck) had monthend storage in the average to above average range;
107 and 119 percent of average water, respectively.

Yellowstone Basin

The high elevation snow pack in the Yellowstone Basin was above
average on April 1.  The snow pack in the Upper Yellowstone
Basin was 118 percent of average overall.  The snow packs in the Wind,
Bighorn, and Shoshone basins were 192, 125, and 146 percent of average,
respectively.  The snow packs in the Tongue and Powder basins were
111 and 101 percent of average, respectively.

Precipitation during March was above average.  The Upper
Yellowstone River Basin received 145 percent of average precipitation
while the Lower Yellowstone Basin reported 141 percent of average.
The Bighorn Basin received 158 percent of average precipitation while
the Wind River Basin received 330 percent of average. The Little
Bighorn - Upper Tongue basin received 190 percent of average
and the Powder River had 133 percent of average precipitation.

Forecast stream flow in the Yellowstone Basin is near to above
average for the upcoming spring and summer.  Stream flow for the
Yellowstone River above Sidney, Montana is forecast to be 140 percent of
average.  Flow in the Tongue Basin is expected to be about 85 percent
of average.  Flows in the Powder River are expected to be about 83
percent of average.

Monthend storage at Boysen Reservoir was 118 percent of average.
Stored water in Buffalo Bill Reservoir was 131 percent of average.
Monthend storage was 95 percent of average at Bighorn Reservoir.

Platte Basin

The high elevation  snow pack in the Upper North Platte basin was
98 percent of average on April 1.  The snow pack in the North
Platte  Basin below Seminoe Reservoir was 95 percent of average.
The snow pack in the South Platte Basin was 96 percent of average.

Precipitation during March in the Upper North Platte Basin was 50
percent of average. In the Lower North Platte Basin precipitation
was 116 percent of average. The North Platte Plains below Guernsy Reservoir
had 170 percent of average precipitation.  The South Platte mountains
had 60 percent whereas the plains had 111 percent of average
March precipitation.

Stream flow in the Platte basin is forecast range from below to above average
during the upcoming spring and summer. Runoff for streams
above Seminoe Reservoir are expected to be about 133 percent
of average.  Streams in the South Platte Basin above South Platte,
Colorado can expect 62 percent of average flow. For the remainder
of the South Platte Basin flows are expected near 75 percent of average.

Stored water in the South Platte basin was 106 percent of average
on April 1.




ESPKRF
Water Supply Forecast
NWS Missouri Basin River Forecast Center
Pleasant Hill, Missouri

1200 CST Wednesday April 12 2017

Data current as of: April 11 2017

Missouri/Yellowstone/Platte River Basin Forecasts

                                        50%   %   10%  90%  AVG
Forecast Point                  Period (KAF) AVG (KAF)(KAF)(KAF)
-----------------------------------------------------------------
Boysen Reservoir Inflow         Apr-Sep 1807 233% 2289 1546 775
SBDW4N
Bighorn R at Kane               Apr-Sep 3041 198% 3866 2613 1539
LVEW4N
Greybull R nr Meeteetse         Apr-Sep 266  111% 413  207  240
MEEW4N
Buffalo Bill Reservoir Inflow   Apr-Sep 1110 140% 1292 970  792
CDYW4N
St Mary R nr Babb               Apr-Sep 281  65%  348  221  432
SMYM8N
St Mary R at Int Boundary       Apr-Sep 334  67%  431  261  497
SMBM8N
Milk R nr Cutbank               Apr-Sep 23   66%  83   12   35
PDBM8N
Milk R at Eastern Crossing      Apr-Sep 38   65%  142  19   58
ERNM8N
North Platte R nr Northgate     Apr-Sep 434  197% 535  367  220
NGTC2
Encampment R nr Encampment      Apr-Sep 189  115% 224  160  164
ERCW4
Encampment R nr Encampment      Apr-Sep 197  114% 233  168  172
ECRW4N
Rock Ck nr Arlington            Apr-Sep 54   119% 64   44   45
KCRW4
Rock Ck nr Arlington            Apr-Sep 55   119% 65   45   46
KCRW4N
Seminoe Reservoir Inflow WY     Apr-Sep 985  136% 1254 795  723
SETW4
Seminoe Reservoir Inflow WY     Apr-Sep 1131 130% 1403 943  870
SETW4N
Laramie R nr Woods              Apr-Sep 73   123% 107  49   59
WODW4
Laramie R nr Woods              Apr-Sep 108  114% 142  84   94
WODW4N
Little Laramie R nr Filmore     Apr-Sep 62   124% 79   48   50
SMTW4
Little Laramie R nr Filmore     Apr-Sep 64   123% 81   50   52
SMTW4N
Antero Reservoir Inflow         Apr-Sep 15   93%  20   11   16
ANRC2N
Spinney Mountain Res Inflow     Apr-Sep 41   71%  73   30   57
SPYC2N
Elevenmile Canyon Res Inflow    Apr-Sep 44   70%  77   31   62
EVNC2N
Cheesman Lake Inflow            Apr-Sep 74   62%  147  49   119
CHEC2N
South Platte R at South Platte  Apr-Sep 128  62%  258  93   207
SPTC2N
Bear Ck at Morrison             Apr-Sep 11   58%  25   7    18
MRRC2N
Clear Ck at Golden              Apr-Sep 72   66%  118  49   109
GLDC2N
St Vrain Ck at Lyons            Apr-Sep 79   83%  114  65   95
LNSC2N
Boulder Ck nr Orodell           Apr-Sep 47   87%  90   37   54
OROC2N
S Boulder Ck nr Eldorado Spr    Apr-Sep 21   57%  45   14   37
BELC2N
Cache La Poudre at Canyon Mouth Apr-Sep 193  95%  268  148  202
FTDC2N
Lima Reservoir Inflow           Apr-Sep 34   53%  60   23   65
LRRM8N
Clark Canyon Reservoir Inflow   Apr-Sep 159  94%  245  114  169
CLKM8N
Beaverhead R at Barretts        Apr-Sep 193  96%  286  144  202
BARM8N
Ruby R Reservoir Inflow         Apr-Sep 69   79%  78   52   88
ALRM8N
Big Hole R nr Melrose           Apr-Sep 826  162% 1116 698  509
MLRM8
Big Hole R nr Melrose           Apr-Sep 887  157% 1175 756  567
MLRM8N
Hebgen Reservoir Inflow         Apr-Sep 515  128% 566  465  403
HBDM8N
Ennis Reservoir Inflow          Apr-Sep 768  108% 858  690  713
ELMM8N
Gallatin R nr Gateway           Apr-Sep 451  98%  583  378  459
GLGM8
Gallatin R nr Gateway           Apr-Sep 451  103% 583  378  437
GLGM8N
Gallatin R at Logan             Apr-Sep 411  96%  604  335  430
LOGM8
Gallatin R at Logan             Apr-Sep 544  97%  724  459  563
LOGM8N
Missouri R at Toston            Apr-Sep 2697 114% 3487 2333 2361
TOSM8N
Missouri R at Fort Benton       Apr-Sep 3832 101% 5108 3366 3810
FBNM8N
Missouri R nr Virgelle          Apr-Sep 4374 105% 5891 3842 4156
VRGM8N
Missouri R nr Landusky          Apr-Sep 4592 105% 6142 4043 4379
LDKM8N
Missouri R blw Ft Peck Dam      Apr-Sep 4821 106% 6313 4154 4537
FPKM8N
Gibson Reservoir Inflow         Apr-Sep 618  172% 772  551  359
AGSM8N
Marias R nr Shelby              Apr-Sep 407  145% 539  312  281
SHLM8N
Musselshell R at Harlowtown     Apr-Sep 37   51%  61   22   72
HLWM8N
Yellowstone R at Yellowstone Lk Apr-Sep 1294 188% 1396 1198 689
YLOW4APR
Yellowstone R at Yellowstone Lk Apr-Sep 1483 174% 1600 1378 851
YLOW4N
Yellowstone R at Corwin Springs Apr-Sep 2588 152% 2886 2383 1702
CORM8
Yellowstone R at Corwin Springs Apr-Sep 2912 147% 3182 2683 1977
CORM8N
Yellowstone R at Livingston     Apr-Sep 2791 140% 3156 2567 1997
LIVM8
Yellowstone R at Livingston     Apr-Sep 3167 135% 3513 2926 2349
LIVM8N
Yellowstone R at Billings       Apr-Sep 4401 129% 5230 3991 3412
BILM8
Yellowstone R at Billings       Apr-Sep 5508 123% 6309 5079 4464
BILM8N
Yellowstone R at Miles City     Apr-Sep 10383138% 122769309 7513
MILM8N
Yellowstone R at Sidney         Apr-Sep 10738134% 127209554 7988
SIDM8N
Boulder R at Big Timber         Apr-Sep 200  84%  254  173  239
BTMM8
Boulder R at Big Timber         Apr-Sep 300  89%  354  272  336
BTMM8N
Stillwater R nr Absarokee       Apr-Sep 599  113% 687  553  528
SRAM8
Stillwater R nr Absarokee       Apr-Sep 658  113% 745  612  583
SRAM8N
Clarks Fk Yelwstone R nr Belfry Apr-Sep 820  158% 932  749  519
BFYM4
Clarks Fk Yelwstone R nr Belfry Apr-Sep 892  152% 1002 822  586
BFYM4N
Bighorn R nr St Xavier          Apr-Sep 4300 175% 5266 3741 2463
STXM8N
Little Bighorn R nr Hardin      Apr-Sep 100  103% 141  77   97
HRDM8N
Tongue R nr Dayton              Apr-Sep 94   100% 126  76   94
DAYW4N
Tongue R nr Decker              Apr-Sep 190  79%  288  155  240
DSLM8N
Tongue R Reservoir Inflow       Apr-Sep 194  81%  293  156  240
DKRM8N
Powder R nr Locate              Apr-Sep 248  88%  421  195  281
MHDM8
Powder R nr Locate              Apr-Sep 271  83%  465  204  326
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 volume as simulated by the river
forecast model considering a continuous simulation of the basin
response to historic climate data (observed precipitation and
temperatures) over the period of 1979-2001

The 50%, 10%, and 90% columns indicate the probablility that the
actual volume will exceed the forecast for the valid time period

For more information, please visit:  www.weather.gov/mbrfc/water

$$






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