Water resources data for the 1976 water year for Washington consist of records of stage, discharge, and water quality of streams; stage, contents, and water quality of lakes and reservoirs; and water levels of ground water. This report contains discharge records for 248 gaging stations; stage only records for 3 gaging stations; stage and contents for 44 lakes and reservoirs; water quality for 123 gaging stations, 1 partial-record station, and 7 lakes; and water levels for 108 observations wells. Also included are 172 crest-stage partial-record stations and 1 low-flow partial-record station. Additional water data were collected at various sites, not involved in the systematic data collection program, and are published as miscellaneous measurements. 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 Washington.