Water resources data for the 1985 water year for Arizona consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; water levels of observation wells; and quality of ground water. This report contains discharge records for 186 gaging stations, annual peaks for 24 crest-stage partial-record stations, and discharge measurements at 7 miscellaneous sites; contents only records for 8 lakes and reservoirs; stage and contents for 1 lake; elevation only for 1 streamflow station; 18 supplementary records, included with gaging-station records, consisting of monthend or monthly stage, contents, and evaporation of lakes and reservoirs, diversions, and return flows; water-quality records for 34 continuous-record stations and 5 miscellaneous sites; water levels for 95 observation wells; and water-quality data for water from 230 wells. The data re-present that part of the National Water Data System operated by the U.S. Geological Survey and cooperating Federal and State Agencies in Arizona.