Water Resources Data for the 1983 water year for Connecticut consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels and water quality of ground-water wells. This volume contains records for water discharge at 47 gaging stations; storm discharge at 7 gaging stations; tidal volume at 1 gaging station; tidal stage at 4 gaging stations; contents at 35 lakes and reservoirs; water quality at 38 gaging stations, 4 lakes and reservoirs, 2 harbors, 3 precipitation stations, 6 partial-record stations, and 23 wells; and water levels at 32 observation wells. Also included are 41 crest-stage partial-record stations. Locations of these sites are shown on figures 2, 3, and 4. Additional water data were collected at various sites involved in the systematic data-collection program and are published as miscellaneous measurements and analyses. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Connecticut.