Extended Streamflow Prediction
Issued by NWS

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FGUS65 KSTR 051945
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH


                      WATER SUPPLY INFORMATION FOR
                            SOUTHWEST WYOMING
                                 AS OF
                              January 5, 2018


PRECIPITATION(% OF AVERAGE) AND SNOWPACK (% OF MEDIAN):

SUBBASIN                    DEC      OCT-DEC     JAN 1       DEC
                          PRECIP     PRECIP      SNOW        FLOW
----------------------    ------     -------     -----     --------
GREEN ABV FLAMING GORGE      90         90        105         150
BEAR RIVER HEADWATERS        75         85         85         105

RESERVOIR STORAGE (KAF) AS OF DECEMBER  31, 2017
Figures are in 1000 Acre Feet
                              C U R R E N T   Y R              L A S T   Y R
                           Usable     EOM Usable % of       EOM Usable   % of
                           Capacity   Contents   Capacity   Contents     Capacity
----------------------------------------------------------------------------------
   GREEN - FONTENELLE RE|      344.8|       203.6|     59|     203.2|     59|
   BIG SANDY - BIG SANDY|       38.3|        29.9|     78|22.0|     57|
   BLACKS FORK - MEEKS C|       29.9|         8.7|     29| 9.7|     33|
   EF SMITHS FORK - STAT|       13.9|         5.8|     42| 6.0|     43|
   GREEN - FLAMING GORGE|     3749.0|      3343.2|     89|    3130.4|     83|

STREAMFLOW FORECASTS:
GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    280   114    375    315    235    190    245
Pine Ck
  Fremont Lk, abv          Apr-Jul    100   102    127    109     86     74     98
New Fork River
  Big Piney, nr            Apr-Jul    355   100    515    420    310    240    355
Green River
  Fontenelle Res, Fontene  Apr-Jul    780   108   1150    925    645    455    725
Big Sandy River
  Farson, nr               Apr-Jul     50    96     75     57     43     30     52
Green River
  Green River, Wy, nr      Apr-Jul    785   108   1170    930    665    470    730
EF Smiths Fork River
  Stateline Res, Robertso  Apr-Jul     23    88     33     28   19.8   14.9     26
Blacks Fork River
  Robertson, nr            Apr-Jul     77    87    112     91     66     47     89
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     40    74     67     49     29     23     54
  Viva Naughton Res        Apr-Jul     53    72    103     69     38     27     74
Green River
  Flaming Gorge Res, Flam  Apr-Jul   1000   102   1550   1160    800    580    980
Little Snake River
  Slater, nr               Apr-Jul    107    69    161    131     73     53    156
  Dixon, nr                Apr-Jul    205    59    350    245    143    100    345

BEAR RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul    106    95    144    119     90     62    112
  Woodruff Narrows Rsvr,   Apr-Jul    103    85    153    117     81     50    121
  Montpelier, nr, Stewart  Apr-Jul     86    47    260    181     62     43    182
Smiths Fork River
  Border, nr               Apr-Jul     74    83    113     99     50     33     89

50% Most probable volume in 1000 acre-feet.
%AVG  Most probable volume in percent of the 1981-2010 average.
10% Volume that has a 10 percent chance of being exceeded.
30% Volume that has a 30 percent chance of being exceeded.
90% Volume that has a 90 percent chance of being exceeded.
70% Volume that has a 70 percent chance of being exceeded.
AVG   Average volume for the 1981-2010 period.

All forecast volumes reflect natural flow.  Actual observed flow may
be affected by upstream water management.

CBRFC/Nielson,Kormos




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