Water resources data for the 1979 water year for Missouri consist of records of stage, discharge, and water quality of streams; stage, contents of water quality of lakes and reservoirs; and water levels and water quality of ground-water wells. This volume contains, records for water discharge at 119 gaging stations; stage only at 3 gaging stations; stage and contents at 6 lakes and reservoirs; water quality at 32 gaging stations (including 1 lake) and 3 wells. Also included are data for 114 crest-stage, and 11 water-quality partial-record stations.