Water resources data for the 1977 water year for Oregon consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels and water quality in wells and springs. This report contains discharge records for 28 gaging stations; stage only records for 10 gaging stations; and contents for 45 lakes and reservoirs; water quality for 79 gaging stations, and water levels for 97 observation wells. Also included are 157 crest-stage partial-record stations. Additional water data were collected at various sites, not part of the systematic data collection programs, and are published as miscellaneous measurements. These represent that part of the National Water Data System operated by the U.S. Geological Survey and co-operating State and Federal agencies in Oregon.