Water resources data for the 1973 water year for Oregon consist of stage, discharge of streams, lakes, and reservoirs. This report contains discharge records for 303 gaging stations; stage only records for 6 gaging stations; stage and contents for 38 lakes and reservoirs. Also included are 12 low-flow and 175 crest-stage partial-record stations. Additional water data were collected at various sites not part of the systematic data collection program, and published as miscellaneous measurements. These data represent that part of the National Water Data System operated by U.S. Geological Survey and cooperating local, State, and Federal agencies in Oregon.