Extended Streamflow Prediction
Issued by NWS

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000
FGUS65 KSTR 041757
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH


                      WATER SUPPLY INFORMATION FOR
                            SOUTHWEST WYOMING
                                 AS OF
                              January 4, 2019


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

SUBBASIN                    DEC      OCT-DEC     JAN 1       DEC
                          PRECIP     PRECIP      SNOW        FLOW
----------------------    ------     -------     -----     --------
GREEN ABV FLAMING GORGE      60         95         80          90
BEAR RIVER HEADWATERS        55         90         80          85

RESERVOIR STORAGE (KAF) AS OF DECEMBER  31, 2018
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|       184.1|     53||      203.6|        59|
   BIG SANDY - BIG SANDY|       38.3|        15.2|     40||       29.9|        78|
   BLACKS FORK - MEEKS C|       29.9|         4.1|     14||        8.7|        29|
   EF SMITHS FORK - STAT|       13.9|         3.5|     25||        5.8|        42|
   GREEN - FLAMING GORGE|     3749.0|      3253.2|     87||     3343.2|        89|
   BEAR - WOODRUFF NARRO|       55.8|        20.0|     36||       45.9|        82|

STREAMFLOW FORECASTS:
GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    190    78    285    225    160    127    245
Pine Ck
  Fremont Lk, abv          Apr-Jul     82    84    108     90     70     57     98
New Fork River
  Big Piney, nr            Apr-Jul    250    70    420    310    215    142    355
Green River
  Fontenelle Res, Fontene  Apr-Jul    500    69    860    665    390    225    725
Big Sandy River
  Farson, nr               Apr-Jul     37    71     60     43     32     21     52
Green River
  Green River, Wy, nr      Apr-Jul    505    69    870    650    410    225    730
EF Smiths Fork River
  Stateline Res, Robertso  Apr-Jul     21    81     31     24   17.5   13.7     26
Blacks Fork River
  Robertson, nr            Apr-Jul     72    81    107     84     61     40     89
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     34    63     65     49     25     21     54
  Viva Naughton Res        Apr-Jul     44    59     93     71     33     26     74
Green River
  Flaming Gorge Res, Flam  Apr-Jul    630    64   1220    845    455    300    980
Little Snake River
  Slater, nr               Apr-Jul    125    80    178    149     82     60    156
  Dixon, nr                Apr-Jul    250    72    420    310    165    113    345

Bear River Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul    100    89    141    116     84     60    112
  Woodruff Narrows Rsvr,   Apr-Jul     86    71    156    107     68     41    121
  Montpelier, nr, Stewart  Apr-Jul     85    47    215    127   42.0   17.0    182
Smiths Fork River
  Border, nr               Apr-Jul     72    81    103     90     55     45     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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