Water resources data for the 1986 water year for South Carolina consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels of ground-water wells. This volume contains records for water discharge at 100 gaging stations, stage only at 7 gaging stations, stage and contents at 13 lakes and reservoirs, water quality at 47 gaging stations, and water levels at 40 observation wells. Also included are data for 38 crest-stage partial-record stations. Locations of these sites are shown on figures 3,4,5, and 6. Additional water data were collected at various sites not involved in the systematic data-collection program. These data represent that part of the National Water Data System collected by the U.S. Geological Survey and cooperating State and Federal agencies in South Carolina.