Water resources data for the 2003 water year for Western New York consist of records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs; water levels and water quality of ground-water wells; and quantity and chemical quality of precipitation. This volume contains records for water discharge at 72 gaging stations; stage only at 14 gaging stations; stage and contents at 6 gaging stations, water quality at 7 gaging stations; 62 wells, and 19 partial record stations; water levels at 27 observation wells; daily precipitation totals at 3 sites, and chemical quality of precipitation at 1 site. Also included are data for 39 crest-stage partial record stations. Locations of all these sites are shown on figue 1. Additional water data were collected at various sites not involved in the systematic data collection program and are published as miscellaneous measurements. These data together with the data in volumes 1 and 2 represent that part of the National Water Data System operated by the U.S. Geological Survey in cooperation with State, local, and Federal agencies in New York.