SLCESPCO
National Weather Service
Colorado Basin River Forecast Center
Salt Lake City, Utah
May 17, 2021

San Juan Basin Special Forecast Group

May mid-month Forecasts

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


Rio Blanco  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul    29.0    34.0    41.0        7.7  


Navajo-Chromo  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul    34.0    39.0    47.0        8.4  


Little Navajo-Chromo  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul     2.9     3.3     4.6        1.1  
       May     1.5     1.8     2.6
       Jun     0.2    0.25     0.7
       Jul     0.1    0.15     0.2


Vallecito Reservoir  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul    73.0    90.0   115.0       13.6  
       May    38.0    45.0    50.0
       Jun    14.0    21.0    31.0
       Jul     7.0    10.4    19.0


Navajo Reservoir  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul   270.0   310.0   385.0       81.0  
       May   145.0   155.0   190.0
       Jun    36.0    59.0    80.0
       Jul     8.0    15.0    35.0


Animas-Durango  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul   118.0   148.0   200.0       17.9  
       May    55.0    67.0    80.0
       Jun    33.0    45.0    67.0
       Jul    12.0    18.0    35.0


Lemon Reservoir  FORECAST                   OBSERVED
              90%     50%     10%        Apr 
   Apr-Jul    15.5    19.5    25.5        2.5  
       May     9.5    12.0    14.0
       Jun     2.5     3.5     5.0
       Jul     1.0     1.5     4.0