Extended Streamflow Prediction
Issued by NWS

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477
FGUS65 KSTR 031942
ESPCO

NATIONAL WEATHER SERVICE
COLORADO BASIN RIVER FORECAST CENTER
SALT LAKE CITY, UT

                      WATER SUPPLY INFORMATION FOR

                THE COLORADO RIVER BASIN WITHIN COLORADO

                           May 3, 2018


BASIN CONDITIONS (% OF AVERAGE) AS OF MAY 1:
   *NOTE: SNOW IS % OF MEDIAN

 SUBBASIN                  APR    OCT-APR  MAY1  APR
                          PRECIP  PRECIP   SNOW* STRMFLW
----------------------    ------  -------  ----  --------
   UPPER COLORADO           115     85      70     80
   GUNNISON                  85     65      40     50
   DOLORES/SAN MIGUEL        40     50       5     15
   SAN JUAN                  35     45      15     35
   YAMPA/WHITE              110     85      70     75


RESERVOIR STORAGE (KAF) AS OF APRIL 30:
                            C U R R E N T   Y R      1981-2010
                          EOM      % of     % of     APR 30   Usable
                          Storage  Average  Capacity Avg Storage   Capacity
---------------------------------------------------------------------------
   COLORADO - LAKE GRANB|    420.5|    135|     86||  311.8|     490.3|
   WILLOW CK - WILLOW CK|      7.9|    102|     86||    7.7|       9.1|
   WILLIAMS FORK - WILLI|     69.9|    115|     72||   60.9|      96.9|
   MUDDY CK - WOLFORD MO|     55.0|    115|     83||   47.7|      66.0|
   BLUE - DILLON RES    |    233.4|    109|     92||  213.6|     254.0|
   BLUE - GREEN MTN RES |     63.0|     99|     43||   63.9|     146.9|
   HOMESTAKE CK - HOMEST|     35.9|    191|     83||   18.8|      43.0|
   FRYING PAN - RUEDI RE|     67.4|    108|     66||   62.6|     102.0|
   PLATEAU CK - VEGA RES|     16.1|     88|     49||   18.3|      32.9|
   TAYLOR - TAYLOR PARK |     71.8|    117|     68||   61.2|     106.2|
   GUNNISON - BLUE MESA |    498.3|    109|     60||  457.1|     829.5|
   GUNNISON - MORROW POI|    112.5|    101|     96||  111.8|     117.0|
   GUNNISON - CRYSTAL RE|     15.9|     95|     91||   16.7|      17.5|
   MUDDY CK - PAONIA RES|     11.9|    185|     71||    6.4|      16.7|
   UNCOMPAHGRE - RIDGWAY|     64.2|     96|     77||   66.6|      83.0|
   DOLORES - MCPHEE RES |    274.7|     85|     72||  323.0|     381.1|
   LOS PINOS - VALLECITO|     85.3|    115|     68||   74.0|     125.4|
   SAN JUAN - NAVAJO RES|   1222.4|     90|     72|| 1361.0|    1696.0|
   FLORIDA - LEMON RES, |     21.5|     89|     54||   24.1|      39.8|
   COLORADO - LAKE POWEL|  12669.0|     74|     52||17122.8|   24322.0|


STREAMFLOW FORECASTS:
Developed:                    May 1 2018

Yampa/White Basins
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Yampa River
  Stagecoach Rsvr, abv     Apr-Jul   16.6    72     20     17   15.8   14.1     23
  Stagecoach Rsvr, abv     May-Jul   10.0    62   13.5   10.6    9.2    7.5   16.0
  Steamboat Springs        Apr-Jul    196    75    250    215    180    159    260
  Steamboat Springs        May-Jul    162    74    215    179    146    125    220
Elk River
  Milner, nr               Apr-Jul    275    86    340    295    255    225    320
  Milner, nr               May-Jul    225    78    290    245    205    175    290
Elkhead Ck
  Long Gulch, abv, Hayden  Apr-Jul     42    58     53     46     39     35     73
  Long Gulch, abv, Hayden  May-Jul     24    48     35     28   21.0   17.0     50
Yampa River
  Maybell, nr              Apr-Jul    665    71    825    710    590    535    935
  Maybell, nr              May-Jul    530    68    690    575    455    400    775
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
  Lily, nr                 Apr-Jul    176    51    230    191    150    116    345
  Lily, nr                 May-Jul    145    50    200    160    119     85    290
Yampa River
  Deerlodge Park           Apr-Jul    815    66   1050    880    750    635   1240
  Deerlodge Park           May-Jul    660    65    900    725    595    480   1020
White River
  Meeker, nr               Apr-Jul    148    53    198    163    138    118    280
  Meeker, nr               May-Jul    120    49    170    135    110     90    245
  Watson, nr               Apr-Jul    151    54    205    169    140    119    280
  Watson, nr               May-Jul    122    52    178    140    111     90    235

Upper Colorado, Above Gunnison Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Colorado River
  Lake Granby, Granby, nr  Apr-Jul    185    84    240    205    165    150    220
  Lake Granby, Granby, nr  May-Jul    172    84    225    192    152    137    205
Willow Ck
  Willow Ck Res, Granby,   Apr-Jul     40    85     52     45     34     28     47
  Willow Ck Res, Granby,   May-Jul     35    81     47     40     29     23     43
Fraser River
  Winter Park              Apr-Jul   18.5    95     22     20   17.5   16.0   19.4
  Winter Park              May-Jul   17.3    93     21     18   16.3   14.8   18.6
Williams Fork River
  Williams Fork Res, Pars  Apr-Jul     78    81     96     84     73     65     96
  Williams Fork Res, Pars  May-Jul     72    80     90     78     67     59     90
Blue River
  Dillon Res               Apr-Jul    140    86    175    150    130    115    163
  Dillon Res               May-Jul    129    84    164    139    119    104    153
  Green Mtn Res            Apr-Jul    225    82    275    245    205    180    275
  Green Mtn Res            May-Jul    205    80    255    225    185    160    255
Muddy Ck
  Wolford Mountain Reserv  Apr-Jul     33    61     47     39     29     24     54
  Wolford Mountain Reserv  May-Jul     28    61     42     34   24.0   18.5     46
Colorado River
  Kremmling, nr            Apr-Jul    700    81    900    770    620    550    860
  Kremmling, nr            May-Jul    630    80    830    700    550    480    785
Eagle River
  Gypsum, blo              Apr-Jul    210    63    280    225    190    160    335
  Gypsum, blo              May-Jul    187    59    260    205    168    138    315
Colorado River
  Dotsero, nr              Apr-Jul   1040    74   1340   1150    910    800   1400
  Dotsero, nr              May-Jul    920    72   1220   1030    790    680   1280
Frying Pan River
  Ruedi Res, Basalt, nr    Apr-Jul     88    63    120     98     78     66    139
  Ruedi Res, Basalt, nr    May-Jul     80    62    112     90     70     58    130
Roaring Fork River
  Glenwood Springs         Apr-Jul    420    61    550    460    390    340    690
  Glenwood Springs         May-Jul    380    59    510    420    350    300    640
Colorado River
  Glenwood Springs, blo    Apr-Jul   1480    70   1950   1600   1320   1150   2110
  Glenwood Springs, blo    May-Jul   1320    68   1790   1440   1160    995   1930
  Cameo, nr                Apr-Jul   1570    67   2100   1720   1400   1250   2360
  Cameo, nr                May-Jul   1410    66   1940   1560   1240   1090   2150
Plateau Ck
  Cameo, nr                Apr-Jul     38    31     60     50   30.0   15.0    124
  Cameo, nr                May-Jul     29    28     51     41   21.0    5.7    104

Gunnison Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Taylor River
  Taylor Park Res          Apr-Jul     66    67     81     69     60     53     99
  Taylor Park Res          May-Jul     58    64     73     61     52     45     90
  Almont                   Apr-Jul     94    61    122    102     88     77    155
  Almont                   May-Jul     82    58    110     90     76     65    141
East River
  Almont                   Apr-Jul    107    59    131    113     98     86    182
  Almont                   May-Jul     96    58    120    102     87     75    166
Gunnison River
  Gunnison, nr             Apr-Jul    210    57    265    225    193    173    370
  Gunnison, nr             May-Jul    187    56    240    200    170    150    335
Tomichi Ck
  Gunnison                 Apr-Jul   19.5    26     36     25   17.5   14.5     74
  Gunnison                 May-Jul   14.0    23     30     19   12.0    9.0     62
Lake Fork River
  Gateview                 Apr-Jul     61    50     82     68     53     42    123
  Gateview                 May-Jul     54    47     75     61     46     35    116
Gunnison River
  Blue Mesa Res            Apr-Jul    350    52    460    400    310    280    675
  Blue Mesa Res            May-Jul    300    50    410    350    260    230    600
  Morrow Point Res         Apr-Jul    375    51    485    425    335    305    740
  Morrow Point Res         May-Jul    320    49    430    370    280    250    650
  Crystal Res              Apr-Jul    415    50    525    465    375    345    835
  Crystal Res              May-Jul    355    48    465    405    315    285    735
Muddy Ck
  Paonia Res, Bardine, nr  Mar-Jun     30    31     40     34     26     23     96
  Paonia Res, Bardine, nr  May-Jun     22    32     32     26   18.0   15.0     69
  Paonia Res, Bardine, nr  Apr-Jul     29    30     39     33     25     22     97
  Paonia Res, Bardine, nr  May-Jul     23    31     33     27   19.0   16.0     75
NF Gunnison River
  Somerset, nr             Apr-Jul    128    43    165    138    118    105    295
  Somerset, nr             May-Jul    108    45    145    118     98     85    240
Surface Ck
  Cedaredge                Apr-Jul    3.8    23    5.5    4.3    3.3    3.0   16.8
  Cedaredge                May-Jul    2.8    20    4.5    3.3    2.3    2.0   14.1
Uncompahgre River
  Ridgway Res              Apr-Jul     40    40     50     44     35     30    101
  Ridgway Res              May-Jul     35    38     45     39     30     25     91
  Colona                   Apr-Jul     48    35     65     54     40     34    137
  Colona                   May-Jul     43    36     60     49     35     29    120
  Delta                    Apr-Jul     26    23     42     32   20.0   17.2    113
  Delta                    May-Jul   18.0    19     34     24   12.0    9.0     94
Gunnison River
  Grand Junction, nr       Apr-Jul    555    38    735    620    515    435   1480
  Grand Junction, nr       May-Jul    460    37    640    525    420    340   1240

Dolores Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Dolores River
  Dolores                  Apr-Jul     62    25     79     69     55     50    245
  Dolores                  May-Jul     50    25     67     57     43     38    200
  Mcphee Res               Apr-Jul     62    21     79     69     55     50    295
  Mcphee Res               May-Jul     50    23     67     57     43     38    220
San Miguel River
  Placerville, nr          Apr-Jul     46    36     61     52     42     35    128
  Placerville, nr          May-Jul     40    35     55     46     36     29    113
Dolores River
  Cisco, nr                Apr-Jul    109    19    149    124     95     79    565
  Cisco, nr                May-Jul     95    23    135    110     81     65    415

Upper Colorado, Confluence
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Colorado River
  Cisco, nr                Apr-Jul   2250    51   3200   2600   1900   1650   4440
  Cisco, nr                May-Jul   1970    51   2970   2370   1670   1420   3860

San Juan Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
San Juan River
  Pagosa Springs           Apr-Jul     83    39    103     90     76     63    215
  Pagosa Springs           May-Jul     60    33     80     67     53     40    180
  Carracas, nr             Apr-Jul    146    38    181    156    138    121    380
  Carracas, nr             May-Jul    105    35    140    115     97     80    300
Rio Blanco River
  Pagosa Springs, nr, Bla  Apr-Jul     23    43     29     26   19.7   16.7     54
  Pagosa Springs, nr, Bla  May-Jul   15.0    33     21     18   12.0    9.0     45
Navajo River
  Chromo, nr, Oso Div Dam  Apr-Jul     28    43     37     31     25     22     65
  Chromo, nr, Oso Div Dam  May-Jul     20    37     29     23   17.0   14.0     54
Piedra River
  Arboles, nr              Apr-Jul     57    27     77     64     52     42    210
  Arboles, nr              May-Jul     40    26     60     47     35     25    153
Los Pinos River
  Vallecito Res, Bayfield  Apr-Jul     60    31     85     69     53     46    194
  Vallecito Res, Bayfield  May-Jul     45    26     70     54     38     31    171
San Juan River
  Navajo Res, Archuleta,   Apr-Jul    200    27    280    225    185    147    735
  Navajo Res, Archuleta,   May-Jul    130    23    210    155    115     77    565
Florida River
  Lemon Res, Durango, nr   Apr-Jul   12.1    22   17.1   14.1   10.6    8.1     55
  Lemon Res, Durango, nr   May-Jul    9.0    18   14.0   11.0    7.5    5.0     49
Animas River
  Durango                  Apr-Jul    115    28    180    128     98     83    415
  Durango                  May-Jul     99    27    164    112     82     67    365
San Juan River
  Farmington               Apr-Jul    270    25    385    295    245    183   1100
  Farmington               May-Jul    197    22    310    220    170    110    880
La Plata River
  Hesperus                 Apr-Jul    4.0    17    7.0    5.0    3.5    3.0     23
  Hesperus                 May-Jul    3.0    16    6.0    4.0    2.5    2.0   18.2
San Juan River
  Bluff, nr                Apr-Jul    250    23    370    280    225    193   1100
  Bluff, nr                May-Jul    186    22    305    215    160    130    855
Mancos River
  Mancos, nr               Apr-Jul    6.6    21    9.6    7.6    5.6    4.6     31
  Mancos, nr               May-Jul    5.0    21    8.0    6.0    4.0    3.0     24

Lake Powell
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Colorado River
  Lake Powell, Glen Cyn D  Apr-Jul   3000    42   4180   3300   2610   2080   7160
  Lake Powell, Glen Cyn D  May-Jul   2620    43   3800   2920   2230   1700   6100

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/Moser



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