National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

581
FGUS65 KSTR 052220
ESPWY
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH

                      WATER SUPPLY INFORMATION FOR
                            SOUTHWEST WYOMING
                                 AS OF
                             MAY 5, 2021


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

SUBBASIN                    APR      OCT-APR     MAY 1
                          PRECIP     PRECIP      SNOW
----------------------    ------     -------     -----
GREEN ABV FLAMING GORGE      75         85         70
BEAR RIVER HEADWATERS        60         70         60

RESERVOIR STORAGE (KAF) AS OF APRIL 30, 2021
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|      334.0|       125.2|     37|      145.1|        43|
   BIG SANDY - BIG SANDY|       38.3|        11.5|     30|       26.7|        70|
   BLACKS FORK - MEEKS C|       29.9|         8.4|     28|       15.7|        52|
   EF SMITHS FORK - STAT|       13.9|         4.5|     32|        6.6|        48|
   GREEN - FLAMING GORGE|     3749.0|      3178.3|     85|     3207.0|        86|
   BEAR - WOODRUFF NARRO|       55.8|        26.1|     47|       58.3|       104|


STREAMFLOW FORECASTS:
GREEN RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Green River
  Daniel, nr, Warren Brid  Apr-Jul    169    69    215    194    150    126    245
  Daniel, nr, Warren Brid  May-Jul    156    69    200    181    137    113    225
Pine Ck
  Fremont Lk, abv          Apr-Jul     63    64     80     69     56     46     98
  Fremont Lk, abv          May-Jul     62    65     79     68     55     45     96
New Fork River
  Big Piney, nr            Apr-Jul    170    48    255    198    142     89    355
  Big Piney, nr            May-Jul    154    47    240    182    126     73    330
Green River
  Fontenelle Reservoir, F  Apr-Jul    380    52    535    445    315    225    725
  Fontenelle Reservoir, F  May-Jul    325    51    480    390    260    173    640
Big Sandy River
  Farson, nr               Apr-Jul     27    52     42     32   22.0   17.7     52
  Farson, nr               May-Jul     25    52     40     30   20.0   16.0     48
Green River
  Green River, Wy, nr      Apr-Jul    375    51    530    450    305    220    730
  Green River, Wy, nr      May-Jul    325    51    480    400    255    170    640
EF Smiths Fork River
  Stateline Reservoir, Ro  Apr-Jul   16.2    62     23     19   13.7   11.8     26
  Stateline Reservoir, Ro  May-Jul   15.4    59     22     18   12.9   11.0     26
Blacks Fork River
  Robertson, nr            Apr-Jul     46    52     67     56     39     32     89
  Robertson, nr            May-Jul     44    52     65     54     37     30     85
Hams Fork River
  Frontier, nr, Pole Ck,   Apr-Jul     31    57     44     37     27     24     54
  Frontier, nr, Pole Ck,   May-Jul     26    54     39     32   22.0   19.0     48
  Viva Naughton Reservoir  Apr-Jul     37    50     55     44     33     30     74
  Viva Naughton Reservoir  May-Jul     30    48     48     37     26     23     62
Green River
  Flaming Gorge Reservoir  Apr-Jul    450    46    670    550    365    270    980
  Flaming Gorge Reservoir  May-Jul    380    45    600    480    295    200    845
Little Snake River
  Slater, nr               Apr-Jul     80    51    113     92     69     58    156
  Slater, nr               May-Jul     72    52    105     84     61     50    138
  Dixon, nr                Apr-Jul    148    43    215    177    127    106    345
  Dixon, nr                May-Jul    130    44    195    159    109     88    295

BEAR RIVER BASIN
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul     54    48     67     59     49     42    112
  Utah-Wyoming State Line  May-Jul     50    48     63     55     45     38    104
  Woodruff Narrows Rsvr,    Apr-Jul     32    26     40     35     26     23    121
  Woodruff Narrows Rsvr,    May-Jul     30    29     38     33     24     21    105
  Montpelier, nr, Stewart  Apr-Jul     32    18     47     39   24.0   19.2    182
  Montpelier, nr, Stewart  May-Jul     25    17     40     32   17.0   12.0    145
Smiths Fork River
  Border, nr               Apr-Jul     49    55     63     54     45     38     89
  Border, nr               May-Jul     44    55     58     49     40     33     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/Bernard