Water-level records for the San Luis Valley of Colorado, 1973-77

Water-level measurements were made in 122 wells in January 1977. Changes in water levels from January 1976 to January 1977 ranged from a rise of 10.0 feet (3.0 meters) to a decline of 8.6 feet (2.6 meters) both of which occurred in Costilla County. Measurements for the three preceding winters are included to illustrate longer term water-levels changes .