Water resources data for the 1987 water year for Tennessee consist of records of stage, discharge, and water quality of streams and springs; stage, contents, and water quality of lakes and reservoirs; water levels and water quality of wells; and quantity and quality of precipitation. This report contains discharge records for 100 gaging stations; stage only records for 6 gaging stations; elevation and contents for 27 lakes and reservoirs; water quality for 37 stations and 149 wells; water levels for 32 observation wells; and 1 precipitation station. Also included are 89 crest-stage partial-record stations and 82 low-flow partial-record stations. Additional water data were collected at various stream and spring sites not 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 Tennessee.