Extended Streamflow Prediction
Issued by NWS

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000
FGUS65 KSTR 032107
ESPNM
TTAA00 KSLR DDHHMM
COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE
SALT LAKE CITY UT
April 1, 2020

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              85             70               100
ANIMAS                       120             85               105

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

                         MAR FLOW       OCT-MAR FLOW
----------------------   --------       ------------
BASIN AVERAGE                45%             50%

******************************************************************************
RESERVOIR STORAGE (KAF) AS OF MARCH 31, 2020:
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
----------------------------------------------------------------------------------
   LOS PINOS - VALLECITO|      125.4|        83.5|     67|       40.3|        32|
   SAN JUAN - NAVAJO RES|     1696.0|      1292.5|     76|      955.5|        56|
   FLORIDA - LEMON RESER|       39.8|        17.7|     45|        7.3|        18|

*********************************************************************************
STREAMFLOW FORECASTS

San Juan River watershed
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
San Juan River
  Pagosa Springs           Apr-Jul    132    61    197    159    118    100    215
  Carracas, nr             Apr-Jul    230    61    330    270    197    170    380
Rio Blanco River
  Pagosa Springs, nr, Bla  Apr-Jul     35    65     48     40     29     25     54
Little Navajo River
  Oso Div Dam,bl,chromo,n  Apr-Jul    4.6    61    7.0    5.5    3.9    3.0    7.6
Navajo River
  Chromo, nr, Oso Div Dam  Apr-Jul     40    62     54     46     33     28     65
Piedra River
  Arboles, nr              Apr-Jul    135    64    205    164    115     97    210
Los Pinos River
  Vallecito Reservoir, Ba  Apr-Jul    151    78    205    169    126    108    194
San Juan River
  Navajo Reservoir, Archu  Apr-Jul    440    60    645    530    370    300    735
Florida River
  Lemon Reservoir, Durang  Apr-Jul     41    75     58     48     34     29     55
Animas River
  Durango                  Apr-Jul    310    75    425    370    255    210    415
San Juan River
  Farmington               Apr-Jul    675    61   1020    845    545    460   1100
La Plata River
  Hesperus                 Apr-Jul   18.0    78     27     22   14.5   12.1     23
San Juan River
  Bluff, nr                Apr-Jul    680    62   1050    865    535    455   1100
Mancos River
  Mancos, nr               Apr-Jul   18.0    58     27     22   13.2   10.6     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/Nielson


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