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758
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COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE
SALT LAKE CITY UT
Apr 3, 2018




WATER SUPPLY INFORMATION FOR
    SAN JUAN RIVER BASIN


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

SUBBASIN                 MAR PRECIP     OCT-MAR PREC    APR 1 SNOWPACK
----------------------   ----------     ------------    ---------------
ABOVE NAVAJO RES              45             50                55
ANIMAS                        40             40                50
LOWER SAN JUAN                45             40                 -

******************************************************************************
OBSERVED STREAMFLOW SUMMARY (% OF AVERAGE):

                         MAR FLOW       OCT-MAR FLOW
----------------------   --------       ------------
BASIN AVERAGE               30%             50%

******************************************************************************
RESERVOIR STORAGE AS OF APR 1:

RESERVOIR                % CAPACITY*
---------------------    ----------
NAVAJO                       73
VALLECITO                    58
LEMON                        47

TOTAL                        71


Most Recent April-July Runoff Forecasts for the San Juan Basin:

San Juan River Basin
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
San Juan River
  Pagosa Springs           Apr-Jul    105    49    145    120     92     80    215
  Carracas, nr             Apr-Jul    160    42    220    185    138    120    380
Rio Blanco River
  Pagosa Springs, nr, Bla  Apr-Jul     26    48     37     30   22.0   19.0     54
Navajo River
  Chromo, nr, Oso Div Dam  Apr-Jul     32    49     43     37     26     22     65
Piedra River
  Arboles, nr              Apr-Jul     60    29     93     73     52     43    210
Los Pinos River
  Vallecito Res, Bayfield  Apr-Jul     60    31     96     71     47     38    194
San Juan River
  Navajo Res, Archuleta,   Apr-Jul    235    32    350    265    197    168    735
Florida River
  Lemon Res, Durango, nr   Apr-Jul   12.0    22     22     16    9.0    6.0     55
Animas River
  Durango                  Apr-Jul    132    32    205    160    111     90    415
San Juan River
  Farmington               Apr-Jul    310    28    485    385    265    215   1100
La Plata River
  Hesperus                 Apr-Jul    5.0    22    9.0    7.0    4.0    3.0     23
San Juan River
  Bluff, nr                Apr-Jul    300    27    475    370    240    195   1100
Mancos River
  Mancos, nr               Apr-Jul    8.0    26   13.0   10.0    6.0    4.0     31

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/G. Smith