Water resources data for the 2004 water year for Western New York consist of records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs; ground-water levels and water quality; and quantity and chemical quality of precipitation. This volume contains records for water discharge at 71 gaging stations; stage only at 15 gaging stations; stage and contents at 6 gaging stations; water quality at 12 gaging stations, 29 wells, and 22 partial-record stations; water levels at 29 observation wells; daily precipitation totals at 1 site, and chemical quality of precipitation at 1 site. Also included are data for 38 crest-stage partial-record stations. Locations of these sites are shown on figure 1. Additional water data were collected at various sites not involved in the systematic data-collection program and are published as measurements made at miscellaneous sites. Surface-water, ground-water, and water-quality data at all sites are listed in Eastern Standard Time (EST), unless otherwise noted. These data together with the data in Volumes 1 and 2 represent that part of the National Water Information System operated by the U.S. Geological Survey and cooperating State, local, and Federal agencies in New York.