Extended Streamflow Prediction
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000
FGUS65 KSTR 051959
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH


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


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

SUBBASIN                    MAY      OCT-MAY
                          PRECIP     PRECIP
----------------------    ------     -------
GREEN ABV FLAMING GORGE    120          95
BEAR RIVER HEADWATERS       75          85

RESERVOIR STORAGE (KAF) AS OF MAY 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     MAY 31        Usable
                          Storage  Average  Capacity   Storage  Average  Avg Storage   Capacity
------------------------------------------------------------------------------------------------
   GREEN - FONTENELLE RE|    260.4|    159|     76| 129.5|     79|     164.0|     344.8|
   BIG SANDY - BIG SANDY|     38.5|    131|    101|  38.4|    131|      29.4|38.3|
   BLACKS FORK - MEEKS C|     30.2|    121|    101|  28.8|    115|      24.9|29.9|
   EF SMITHS FORK - STAT|     14.0|    124|    101|  14.1|    125|      11.3|13.9|
   GREEN - FLAMING GORGE|   3294.2|    107|     88|3202.9|    104|    3071.5|    3749.0|

STREAMFLOW FORECASTS:

GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    385   157    425    400    365    355    245
  Daniel, nr, Warren Brid  Jun-Jul    225   134    265    240    205    195    168
Pine Ck
  Fremont Lk, abv          Apr-Jul    108   110    125    112    102     97     98
  Fremont Lk, abv          Jun-Jul     68    89     85     72     62     57     76
New Fork River
  Big Piney, nr            Apr-Jul    405   114    470    430    385    365    355
  Big Piney, nr            Jun-Jul    215    84    280    240    196    175    255
Green River
  Fontenelle Res, Fontene  Apr-Jul    980   135   1120   1030    950    895    725
  Fontenelle Res, Fontene  Jun-Jul    525   111    660    570    495    440    475
Big Sandy River
  Farson, nr               Apr-Jul     56   108     65     60     54     49     52
  Farson, nr               Jun-Jul     30    88     39     34     28     23     34
Green River
  Green River, Wy, nr      Apr-Jul    995   136   1130   1030    955    905    730
  Green River, Wy, nr      Jun-Jul    540   112    670    570    500    450    480
EF Smiths Fork River
  Stateline Res, Robertso  Apr-Jul     23    88     26     24     22     20     26
  Stateline Res, Robertso  Jun-Jul   11.0    62   14.0   12.2   10.3    8.5   17.8
Blacks Fork River
  Robertson, nr            Apr-Jul     72    81     82     76     68     63     89
  Robertson, nr            Jun-Jul     32    54     42     36     28     23     59
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     44    81     52     46     42     39     54
  Frontier, nr, Pole Ck,   Jun-Jul   12.0    46     20     14   10.5    7.5     26
  Viva Naughton Res        Apr-Jul     56    76     65     59     54     51     74
  Viva Naughton Res        Jun-Jul   13.1    42     22     16   11.5    8.5     31
Green River
  Flaming Gorge Res, Flam  Apr-Jul   1120   114   1300   1190   1050    995    980
  Flaming Gorge Res, Flam  Jun-Jul    575    96    760    650    510    450    600
Little Snake River
  Slater, nr               Apr-Jul     94    60    109    101     88     87    156
  Slater, nr               Jun-Jul   17.1    26     32     24   11.1   10.0     66
  Dixon, nr                Apr-Jul    136    39    161    146    130    125    345
  Dixon, nr                Jun-Jul     22    16     47     32   15.6   11.0    135

BEAR RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul     89    79    104     94     85     75    112
  Utah-Wyoming State Line  Jun-Jul     36    55     51     41     32     22     66
  Woodruff Narrows Rsvr,   Apr-Jul     63    52     81     68     58     49    121
  Woodruff Narrows Rsvr,   Jun-Jul   19.3    34     37     24   14.3    5.3     57
  Montpelier, nr, Stewart  Apr-Jul     70    38     99     80     64     58    182
  Montpelier, nr, Stewart  Jun-Jul   14.4    16     44     25    8.6    2.8     91
Smiths Fork River
  Border, nr               Apr-Jul     87    98     95     90     81     74     89
  Border, nr               Jun-Jul     39    78     47     42     33     26     50


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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