Extended Streamflow Prediction
Issued by NWS

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000
FGUS65 KSTR 032041
ESPUT

COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE
SALT LAKE CITY UT
April 3, 2020
                     WATER SUPPLY INFORMATION FOR
                                 UTAH

                             APR 1, 2020


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

SUBBASIN                 MAR PRECIP    OCT-MAR PRECIP   APR 1 SNOWPACK
----------------------   ----------     ------------     -------------
BEAR                        105              95               105
WEBER                       100              90               100
SIX CREEKS (SLC)             75              95               115
PROVO                        90              85                95
SEVIER                       95              95               105
VIRGIN                      135             110               140
DUCHESNE                    115              95               110
PRICE/SAN RAFAEL             90              90               100

STREAMFLOW VOLUME FORECASTS:
Developed:                    Apr 1 2020

Great Salt Lake Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Bear River
  Utah-Wyoming State Line  Apr-Jul    113   101    147    128    108     97    112
  Woodruff Narrows Rsvr,   Apr-Jul    107    88    159    123     96     89    121
  Montpelier, nr, Stewart  Apr-Jul    190   104    300    240    180    165    182
Smiths Fork River
  Border, nr               Apr-Jul     91   102    111    101     84     79     89
Logan River
  Logan, nr, State Dam, a  Apr-Jul    107    96    134    116     96     92    111
Blacksmith Fork River
  Hyrum, nr, Upnl Dam, ab  Apr-Jul     42    98     65     49     40     37     43
Little Bear River
  Paradise                 Apr-Jul     38    81     63     51     35     30     47
Weber River
  Oakley, nr               Apr-Jul     97    82    137    112     91     82    118
  Rockport Res, Wanship,   Apr-Jul    103    78    157    123     97     84    132
  Coalville, nr            Apr-Jul    104    78    164    127     99     86    134
Chalk Ck
  Coalville                Apr-Jul     22    54     49     31   17.7   15.0     41
Weber River
  Echo Reservoir, Echo, a  Apr-Jul    125    73    210    156    116     99    171
Lost Ck
  Lost Ck Reservoir, Croy  Apr-Jul   10.6    79   15.8   12.1   10.0    8.0   13.4
East Canyon Ck
  East Canyon Reservoir,   Apr-Jul     28   104     45     36     25     22     27
SF Ogden River
  Huntsville, nr           Apr-Jul     57   102     89     68     54     49     56
Ogden River
  Pineview Reservoir, Ogd  Apr-Jul    110    97    173    131    101     88    113
Weber River
  Gateway                  Apr-Jul    235    72    380    295    215    185    325
Provo River
  Woodland, nr             Apr-Jul    100   100    129    108     93     83    100
  Hailstone, nr            Apr-Jul    110   100    141    117    102     90    110
  Deer Ck Reservoir        Apr-Jul    121    95    164    132    113    100    127
American Fork River
  American Fork, nr, Up P  Apr-Jul     23    74     30     26   20.0   18.9     31
Spanish Fork River
  Castilla, nr             Apr-Jul     35    51     49     39     33     30     69
Jordan River
  Utah Lake, Provo, nr     Apr-Jul    225    69    325    270    215    194    325
Little Cottonwood Ck
  Salt Lake City, nr       Apr-Jul     37    97     45     41     34     33     38
Big Cottonwood Ck
  Salt Lake City, nr       Apr-Jul     35    97     45     39     32     30     36
City Ck
  Salt Lake City, nr       Apr-Jul    6.3    82    8.4    7.4    5.8    5.4    7.7
Mill Ck
  Salt Lake City, nr       Apr-Jul    6.0    94    7.8    6.5    5.6    4.9    6.4
Dell Fk River
  Little Dell Reservoir    Apr-Jul    5.5   100    8.2    6.3    5.0    4.4    5.5
Lambs Ck
  Salt Lake City, nr       Apr-Jul    5.1    96    7.3    5.9    4.5    3.7    5.3
Parleys Ck
  Salt Lake City, nr       Apr-Jul   13.5    95     20     16   12.1   10.5   14.2
S Willow Ck
  Grantsville, nr          Apr-Jul    2.4    77    3.4    2.9   2.20   1.91    3.1
Red Butte Ck
  Ft Douglas, at, Salt La  Apr-Jul   1.48    78    2.2    1.9   1.30   1.07   1.90
West Canyon Ck
  Cedar Fort, nr           Apr-Jul   1.09    62    2.3    1.5   0.95   0.56   1.76

Sevier Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Sevier River
  Hatch                    Apr-Jul     36    75     45     38     28     24     48
  Kingston, nr             Apr-Jul   16.9    51     29     23   11.8    6.0     33
EF Sevier River
  Kingston, nr             Apr-Jul     48   137     58     52     47     42     35
Clear Ck
  Sevier, nr, Diversions,  Apr-Jul   19.8    94     28     22   16.3   14.1     21
Salina Ck
  Emery, nr                Apr-Jul    6.0    76   10.7    7.3    5.2    3.4    7.9
Sevier River
  Gunnison, nr             Apr-Jul     75    76    128     92     54     37     99
Beaver River
  Beaver, nr               Apr-Jul     24    92     38     29   22.0   19.0     26
Coal Ck
  Cedar City, nr           Apr-Jul   18.4    95     23     19   16.3   13.0   19.4

Eastern Utah - Green River Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Blacks Fork River
  Robertson, nr            Apr-Jul     85    96    118    100     73     67     89
Green River
  Flaming Gorge Reservoir  Apr-Jul    880    90   1400   1100    750    680    980
White River
  Watson, nr               Apr-Jul    260    93    335    285    235    210    280
Big Brush Ck
  Vernal, nr, Red Fleet R  Apr-Jul     20    95     29     22   17.0   14.0     21
Ashley Ck
  Vernal, nr               Apr-Jul     45    90     70     50     35     30     50
Whiterocks River
  Whiterocks, nr           Apr-Jul     45    83     71     53     40     34     54
Uinta River
  Neola, nr                Apr-Jul     70    95    100     78     60     50     74
Yellowstone River
  Altonah, nr              Apr-Jul     62   102     84     67     55     45     61
Lake Fork River
  Moon Lake Reservoir, Mt  Apr-Jul     57    86     74     63     50     43     66
Rock Ck
  Upper Stillwater Reserv  Apr-Jul     70    95     95     79     64     55     74
South Fork Rock Ck
  Docs Div, blo            Apr-Jul    6.0    82    8.5    7.0    5.0    4.5    7.3
Rock Ck
  Mountain Home, nr        Apr-Jul     83    94    112     93     75     66     88
West Fork Duchesne River
  Vat Diversion, blo       Apr-Jul   15.0    81     22     17   13.0   11.0   18.6
Duchesne River
  Tabiona, nr              Apr-Jul     95    88    120    102     87     79    108
  Duchesne, nr, Knight Di  Apr-Jul    175    90    230    195    165    145    194
Currant Ck
  Currant Ck Reservoir     Apr-Jul   17.0    85     24     19   15.0   13.5     20
Strawberry River
  Strawberry Reservoir, S  Apr-Jul     45    63     70     53     33     30     71
  Starvation Reservoir, D  Apr-Jul     90    80    130    100     81     73    112
Duchesne River
  Myton                    Apr-Jul    255    77    400    310    230    185    330
  Randlett, nr             Apr-Jul    280    73    450    330    245    195    385
Fish Ck
  Scofield, nr, Reservoir  Apr-Jul     25    83     34     28     22     20     30
Price River
  Scofield Reservoir, Sco  Apr-Jul     34    83     47     38     30     27     41
White River
  Blo Tabbyune Ck, Soldie  Apr-Jul   13.0    84     21     16   11.5    9.0   15.5
Green River
  Green River, Ut          Apr-Jul   2750    93   4000   3300   2500   2200   2960
Huntington Ck
  Electric Lake            Apr-Jul    9.7    73   15.0   12.0    8.0    7.0   13.3
  Power Plant, blo -Hunti  Apr-Jul     37    92     54     44     32     26     40
Seeley Ck
  Joes Vly Reservoir, Ora  Apr-Jul     47    84     65     52     41     33     56
Ferron Ck
  Ferron, nr               Apr-Jul     34    89     48     37     30     25     38
Muddy Ck
  Emery, nr                Apr-Jul   13.7    69     21     17   12.0   10.0   19.9

Upper Colorado Basin - UC and Dolores
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Dolores River
  Cisco, nr                Apr-Jul    350    62    505    415    285    220    565
Colorado River
  Cisco, nr                Apr-Jul   3500    79   4850   4100   3100   2700   4440
  Lake Powell, Glen Cyn D  Apr-Jul   5600    78   8100   6500   5000   4100   7160

San Juan Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
San Juan River
  Bluff, nr                Apr-Jul    680    62   1050    865    535    455   1100

Lower Colorado Basin - Virgin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
Santa Clara River
  Pine Valley, nr          Apr-Jul    5.7   114    7.7    6.6    4.9    4.2    5.0
Virgin River
  Virgin                   Apr-Jul     59   102     73     65     54     48     58
  Hurricane, nr            Apr-Jul     58    92     73     65     53     48     63
  Littlefield              Apr-Jul     67   103     80     72     62     55     65

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/bmb,bja,pk,zf


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