Water resources data for the 1985 water year for Michigan consist of records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs; and water levels and water temperature of ground water. This report contains discharge records for 135 gaging stations; stage only records for 1 gaging station; stage and contents for 5 lakes and reservoirs; water-quality records for 52 gaging stations; water-level records for 53 observation wells; and water-temperature records for 6 observation wells. Also included are 52 crest-stage partial-record stations and 30 low-flow partial-record stations. Additional water data were collected at various sites not involved in the systematic data-collection program. Miscellaneous data were collected at 41 measuring sites and 1 water-quality sampling site. These data represent that part of the National Water Data System collected by the U.S. Geological Survey and cooperating State, Local, and Federal agencies in Michigan.