Water resources data for the 1978 water year for New York consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; water quality of precipitation; and water levels and water quality of ground-water wells. This volume contains records for water discharge at 188 gaging stations; stage only at 22 gaging stations; stage and contents at 21 lakes and reservoirs; water quality at 67 gaging stations, 10 precipitation stations, and 10 wells; and water levels at 44 observation wells. Also included are data for 144 crest-stage, 20 low-flow, and 7 water-quality partial-record stations. Additional water data were collected at various sites not involved in the systematic data-collection program and are published as miscellaneous measurements and analyses. These data together with the data in Volume 2 represent that part of the National Water Data System operated by the U.S. Geological Survey in cooperation with State, Federal, and other agencies in New York.