Water resources data for the 1981 water year for Missouri consist of records of stage, discharge, and water quality of lakes and reservoirs; contains records for water discharge at 124 gaging stations; stage and contents at 7 lakes and reservoirs; water quality at 33 gaging stations (including 1 lake); 11 sites measured bi-monthly, 2 USGS water quality monitors, and 1 temperature (continuous recording) site. Also included are data for 30 crest-stage, 11 water-quality partial-record stations, and 20 low-flow partial-record stations.