Water resources data for the 1992 water year for Pennsylvania consists of records of discharge and water quality of streams; contents and elevations of lakes and reservoirs; and water levels of ground-water wells. This report, Volume 3, includes records from the Ohio and St. Lawrence River basins. Specifically, it contains: (1) discharge records for 69 continuous record streamflow-gaging stations and 12 partial-record stations; (2) elevation and contents records for 3 lakes and reservoirs; (3) water-quality records for 3 streamflow-gaging stations and 36 partial-record stations; and (4) water-level records for 20 network observation wells. Locations of these sites are shown on figures 4-5. 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 1 and 2, represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State, Local, and Federal agencies in Pennsylvania.