Water resources data for the 2004 water year for Tennessee consists of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels and water quality of ground water. This report contains records for water discharge at 107 gaging stations; stage only for 1 gaging station, elevation and contents for 32 lakes reservoirs; water quality at 18 gaging stations and 17 wells; and water levels for 8 observation wells; and 1 precipitation station. Also included are data for 84 crest stage partial-record stations. Additional water data were collected at various stream sites not involved in the systematic data-collection program, and are published as miscellaneous measurements and analyses. These data represent the part of the National Water Data System operated by the US Geological Survey and cooperating State and Federal agencies in Tennessee.