SLCESPCO
National Weather Service
Colorado Basin River Forecast Center
Salt Lake City, Utah
June 16, 2021

San Juan Basin Special Forecast Group

June mid-month Forecasts

Seasonal and Monthly forecasts
Forecast volumes in thousands of acre-feet (KAF)


Rio Blanco  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul    32.0    34.0    36.0        7.7    14.6  


Navajo-Chromo  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul    40.0    42.0    44.0        8.4    16.1  


Little Navajo-Chromo  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul     3.3     3.4     3.5        1.1     1.7  
       Jun    0.38    0.40    0.50
       Jul    0.12    0.15    0.20
       Aug    0.10    0.20    0.30


Vallecito Reservoir  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul   117.0   120.0   129.0       13.6    50.0  
       Jun    41.0    43.0    44.0
       Jul    12.4    13.4    21.0
       Aug     7.0    10.5    19.0


Navajo Reservoir  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul   345.0   360.0   390.0       81.0   169.0  
       Jun    93.0   100.0   108.0
       Jul     2.0    10.0    32.0
       Aug     7.0    20.0    40.0


Animas-Durango  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul   195.0   205.0   225.0       17.9    72.0  
       Jun    84.0    91.0    96.0
       Jul    21.0    24.0    39.0
       Aug    12.0    16.1    30.0


Lemon Reservoir  FORECAST                   OBSERVED
              90%     50%     10%        Apr     May 
   Apr-Jul    26.0    27.0    31.0        2.5    13.6  
       Jun     8.0     8.8     9.6
       Jul     1.9     2.1     5.3
       Aug     1.1     2.0     4.5