Extended Streamflow Prediction
Issued by NWS

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000
FGUS65 KSTR 041743
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH

                      WATER SUPPLY INFORMATION FOR
                            SOUTHWEST WYOMING
                                 AS OF
                             March 4, 2020


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

SUBBASIN                    FEB      OCT-FEB     MAR 1       FEB
                          PRECIP     PRECIP      SNOW        FLOW
----------------------    ------     -------     -----     --------
GREEN ABV FLAMING GORGE      95         90        115        110
BEAR RIVER HEADWATERS       120         95         95        105

RESERVOIR STORAGE (KAF) AS OF February 29, 2020
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|    147.3|    115|     43||      120.1|     94||      127.6|     344.8|
   BIG SANDY - BIG SANDY|     23.1|    153|     60||       16.5|    109||       15.1|      38.3|
   BLACKS FORK - MEEKS C|     11.0|     89|     37||        5.9|     48||       12.3|      29.9|
   EF SMITHS FORK - STAT|      5.7|    107|     41||        3.9|     73||        5.4|      13.9|
   GREEN - FLAMING GORGE|   3225.3|    107|     86||     3148.8|    104||     3015.6|    3749.0|
   BEAR - WOODRUFF NARRO|     52.6|    167|     94||       22.0|     70||       31.4|      55.8|

STREAMFLOW FORECASTS:
Developed:                    Mar 1 2020

GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    220    90    280    245    195    170    245
Pine Ck
  Fremont Lk, abv          Apr-Jul     88    90    103     93     72     63     98
New Fork River
  Big Piney, nr            Apr-Jul    270    76    380    320    215    170    355
Green River
  Fontenelle Reservoir, F  Apr-Jul    620    86    880    720    525    420    725
Big Sandy River
  Farson, nr               Apr-Jul     32    62     52     38     27     20     52
Green River
  Green River, Wy, nr      Apr-Jul    620    85    900    725    535    415    730
EF Smiths Fork River
  Stateline Reservoir, Ro  Apr-Jul     28   108     36     31     25     21     26
Blacks Fork River
  Robertson, nr            Apr-Jul     85    96    120     98     70     60     89
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     45    83     70     55     35     29     54
  Viva Naughton Reservoir  Apr-Jul     60    81    102     76     47     38     74
Green River
  Flaming Gorge Reservoir  Apr-Jul    850    87   1350   1050    660    550    980
Little Snake River
  Slater, nr               Apr-Jul    170   109    230    187    150    120    156
  Dixon, nr                Apr-Jul    360   104    525    400    305    235    345

BEAR RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul    111    99    145    128     97     84    112
  Woodruff Narrows Rsvr,   Apr-Jul    100    83    159    123     83     70    121
  Montpelier, nr, Stewart  Apr-Jul    176    97    290    220    161    135    182
Smiths Fork River
  Border, nr               Apr-Jul     93   104    118    102     80     75     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/Kormos,Alcorn


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