Volume 3 of water resources data for the 1980 water year for California consists of records of stage, discharge, gage-height, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; water levels and water quality of wells. This report contains discharge records for 185 gaging stations; stage and contents for 39 lakes and reservoirs; gage-height records for 2 lakes; water quality for 62 stations; water levels for 56 observation wells. Also included are 11 crest-stage partial-record stations and one water-quality partial-record stations. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in California.