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COLORADO BASIN RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE 
SALT LAKE CITY UT
June 7, 2023

        WATER SUPPLY INFORMATION FOR
            SAN JUAN RIVER BASIN
 

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

SUBBASIN                 MAY PRECIP     OCT-MAY PREC    JUN 1 SNOWPACK
----------------------   ----------     ------------    ---------------
ABOVE NAVAJO RES              95            120             120
ANIMAS                        60            125             155     

**********************************************************************************
RESERVOIR STORAGE (KAF) AS OF MAY 31, 2023:
                           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|        90.7|     72|       92.1|        73| 
---------------------------------------------------------------------------------
   SAN JUAN - NAVAJO RES|     1696.0|      1340.3|     79|      953.6|        56| 
---------------------------------------------------------------------------------
   FLORIDA - LEMON RESER|       39.8|        32.2|     81|       26.3|        66| 
---------------------------------------------------------------------------------
  T O T A L S           |     1861.2|      1463.2|     79|     1071.9|        58|      


**********************************************************************************
STREAMFLOW FORECASTS
San Juan River watershed
                           Period     50%  %AVG    10%    30%    70%    90%    AVG
                           ------    ----  ----   ----   ----   ----   ----    ---
San Juan River
  Pagosa Springs           Apr-Jul    290   149    315    300    280    270    194
  Pagosa Springs           Jun-Jul     80    98    106     90     71     61     82
  Carracas, nr             Apr-Jul    505   153    540    520    490    475    330
  Carracas, nr             Jun-Jul    137   101    173    153    124    106    135
Rio Blanco River
  Pagosa Springs, nr, Bla  Apr-Jul     71   145     77     74     68     66     49
  Pagosa Springs, nr, Bla  Jun-Jul     20   100     26     23   16.8   15.0     20
Little Navajo River
  Oso Div Dam,bl,chromo,n  Apr-Jul   10.4   170   11.0   10.6   10.1    9.8    6.1
  Oso Div Dam,bl,chromo,n  Jun-Jul   1.90   115    2.5    2.1   1.61   1.31   1.65
Navajo River
  Chromo, nr, Oso Div Dam  Apr-Jul     89   153     97     92     86     83     58
  Chromo, nr, Oso Div Dam  Jun-Jul     30   115     38     33     27     24     26
Piedra River
  Arboles, nr              Apr-Jul    305   169    330    315    300    290    181
  Arboles, nr              Jun-Jul     77   124    102     88     71     62     62
Los Pinos River
  Vallecito Reservoir, Ba  Apr-Jul    265   150    290    275    255    245    177
  Vallecito Reservoir, Ba  Jun-Jul    112   127    135    120    100     92     88
San Juan River
  Navajo Reservoir, Archu  Apr-Jul   1010   160   1110   1050    980    945    630
  Navajo Reservoir, Archu  Jun-Jul    275   115    375    320    245    210    240
Florida River
  Lemon Reservoir, Durang  Apr-Jul     73   152     84     77     69     66     48
  Lemon Reservoir, Durang  Jun-Jul     33   143     44     37     29     26     23
Animas River
  Durango                  Apr-Jul    570   148    630    590    550    530    385
  Durango                  Jun-Jul    290   145    350    310    270    250    200
San Juan River
  Bluff, nr                Apr-Jul   1800   162   1930   1850   1760   1700   1110
  Bluff, nr                Jun-Jul    605   126    735    655    560    505    480
Mancos River
  Mancos, nr               Apr-Jul     46   267     49     47     44     43   17.2
  Mancos, nr               Jun-Jul    7.3   203   10.8    8.8    5.8    4.7    3.6
  
50% Volume that has a 50 percent chance of being exceeded (in 1000 acre-feet).
%AVG  50% volume in percent of the 1991-2020 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 1991-2020 period.

All forecast volumes reflect natural flow.  Actual observed flow may
be affected by upstream water management.

CBRFC/Nielson