Extended Streamflow Prediction
Issued by NWS

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000
FGUS65 KSTR 031938
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH


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


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

SUBBASIN                    APR      OCT-APR     MAY 1
                          PRECIP     PRECIP      SNOW
----------------------    ------     -------     -----
GREEN ABV FLAMING GORGE     90          90        100
BEAR RIVER HEADWATERS      100          85         65

RESERVOIR STORAGE (KAF) AS OF APRIL 30, 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     APR 30        Usable
                          Storage  Average  Capacity   Storage  Average  Avg Storage   Capacity
------------------------------------------------------------------------------------------------
   GREEN - FONTENELLE RE|    130.4|    104|     38||      127.8|    102||      125.0|     344.8|
   BIG SANDY - BIG SANDY|     35.8|    168|     93||       28.7|    135||       21.3|      38.3|
   BLACKS FORK - MEEKS C|     18.4|    112|     62||       24.7|    150||       16.5|      29.9|
   EF SMITHS FORK - STAT|      7.6|    117|     55||        9.6|    148||        6.5|      13.9|
   GREEN - FLAMING GORGE|   3185.8|    105|     85||     3084.4|    101||     3040.4|    3749.0|

STREAMFLOW FORECASTS:

GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    340   139    385    360    320    300    245
  Daniel, nr, Warren Brid  May-Jul    315   140    360    335    295    275    225
Pine Ck
  Fremont Lk, abv          Apr-Jul    101   103    119    108     93     80     98
  Fremont Lk, abv          May-Jul     97   101    115    104     89     76     96
New Fork River
  Big Piney, nr            Apr-Jul    360   101    455    390    325    265    355
  Big Piney, nr            May-Jul    335   102    430    365    300    240    330
Green River
  Fontenelle Res, Fontene  Apr-Jul    900   124   1060    975    835    745    725
  Fontenelle Res, Fontene  May-Jul    800   125    955    875    735    645    640
Big Sandy River
  Farson, nr               Apr-Jul     51    98     67     55     46     38     52
  Farson, nr               May-Jul     48   100     64     52     43     35     48
Green River
  Green River, Wy, nr      Apr-Jul    910   125   1060    990    840    760    730
  Green River, Wy, nr      May-Jul    805   126    960    885    735    655    640
EF Smiths Fork River
  Stateline Res, Robertso  Apr-Jul     20    77     26     22   17.8   16.1     26
  Stateline Res, Robertso  May-Jul   19.0    73     25     21   16.5   14.8     26
Blacks Fork River
  Robertson, nr            Apr-Jul     62    70     83     72     56     50     89
  Robertson, nr            May-Jul     56    66     77     66     50     44     85
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     41    76     55     47     36     32     54
  Frontier, nr, Pole Ck,   May-Jul     31    65     45     37     26     22     48
  Viva Naughton Res        Apr-Jul     53    72     71     61     47     42     74
  Viva Naughton Res        May-Jul     37    60     55     45     31     26     62
Green River
  Flaming Gorge Res, Flam  Apr-Jul   1000   102   1210   1120    910    820    980
  Flaming Gorge Res, Flam  May-Jul    880   104   1090   1000    790    700    845
Little Snake River
  Slater, nr               Apr-Jul     93    60    123    102     80     66    156
  Slater, nr               May-Jul     75    54    105     84     62     48    138
  Dixon, nr                Apr-Jul    175    51    230    192    150    117    345
  Dixon, nr                May-Jul    143    48    200    160    118     85    295

Bear River Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul     87    78    105     92     80     69    112
  Utah-Wyoming State Line  May-Jul     77    74     95     82     70     59    104
  Woodruff Narrows Rsvr,   Apr-Jul     67    55     98     72     57     47    121
  Woodruff Narrows Rsvr,   May-Jul     56    53     87     61     46     36    105
  Montpelier, nr, Stewart  Apr-Jul     63    35    113     77     58     40    182
  Montpelier, nr, Stewart  May-Jul     37    26     87     51   32.0   14.0    145
Smiths Fork River
  Border, nr               Apr-Jul     78    88     91     83     74     65     89
  Border, nr               May-Jul     66    82     79     71     62     53     80

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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