Extended Streamflow Prediction
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000
FGUS65 KSTR 041448
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH


                      WATER SUPPLY INFORMATION FOR
                            SOUTHWEST WYOMING
                                 AS OF
                              April 1, 2018


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

SUBBASIN                    MAR      OCT-MAR     APR 1
                          PRECIP     PRECIP      SNOW
----------------------    ------     -------     -----
GREEN ABV FLAMING GORGE     110         90        110
BEAR RIVER HEADWATERS       110         85         70

RESERVOIR STORAGE (KAF) AS OF MARCH 31, 2018
Figures are in 1000 Acre Feet

                            C U R R E N T   Y R         L A S T   Y R    1981-2010
                          EOM      % of     % of       EOM      % of      MAR 31       Usable
                          Storage  Average  Capacity   Storage  Average  Avg Storage   Capacity
------------------------------------------------------------------------------------------------
   GREEN - FONTENELLE RE|    117.4|     96|     34|      206.8|    170|      121.7|     344.8|
   BIG SANDY - BIG SANDY|     33.4|    170|     87|       30.5|    156|       19.6|      38.3|
   BLACKS FORK - MEEKS C|     12.2|     92|     41|       15.8|    118|       13.4|      29.9|
   EF SMITHS FORK - STAT|      6.3|    115|     46|        7.4|    135|        5.5|      13.9|
   GREEN - FLAMING GORGE|   3184.3|    105|     85|     3169.4|    105|     3021.3|    3749.0|

STREAMFLOW FORECASTS:

GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    325   133    375    350    295    280    245
Pine Ck
  Fremont Lk, abv          Apr-Jul    101   103    117    110     95     83     98
New Fork River
  Big Piney, nr            Apr-Jul    370   104    465    420    325    285    355
Green River
  Fontenelle Res, Fontene  Apr-Jul    900   124   1080   1010    780    720    725
Big Sandy River
  Farson, nr               Apr-Jul     52   100     68     60     47     40     52
Green River
  Green River, Wy, nr      Apr-Jul    905   124   1100   1010    790    720    730
EF Smiths Fork River
  Stateline Res, Robertso  Apr-Jul     21    81     26     22   18.7   15.7     26
Blacks Fork River
  Robertson, nr            Apr-Jul     65    73     90     74     59     51     89
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     33    61     49     40     28     26     54
  Viva Naughton Res        Apr-Jul     43    58     65     52     36     33     74
Green River
  Flaming Gorge Res, Flam  Apr-Jul   1000   102   1300   1130    875    790    980
Little Snake River
  Slater, nr               Apr-Jul     93    60    142    106     82     58    156
  Dixon, nr                Apr-Jul    175    51    285    210    152    107    345

Bear River Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul     90    80    119    104     85     75    112
  Woodruff Narrows Rsvr,   Apr-Jul     79    65    119     90     70     62    121
  Montpelier, nr, Stewart  Apr-Jul     67    37    134     85     52     41    182
Smiths Fork River
  Border, nr               Apr-Jul     77    87     96     84     69     65     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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