Water resources data for the 1987 water year for Oklahoma consists of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes or reservoirs. This report contains discharge records for 123 gaging stations; stage and contents for 30 lakes or reservoirs; water quality for 38 gaging stations and 3 lakes. Also included are 5 partial-record stations. These data represent that part of the National Water Data System collected by the U.S. Geological Survey and cooperating State and Federal agencies in Oklahoma.