Water resources data for the 1987 water year for Idaho consist of records ofstage, discharge, and water quality of streams; stage, contents, and water qualityof lakes and reservoirs; and water levels and water quality of ground water. Thisreport contains discharge records for 230 gaging stations; stage only records for2 gaging stations; stage only for 11 lakes and reservoirs; contents only for 25 lakesand reservoirs; water quality for 24 gaging stations and 52 wells; and water levelsfor 467 observation wells. Additional water data were collected at various sites, notinvolved in the systematic data collection program, and are published as miscellaneousmeasurements. These data represent that part of the National Water Data System operatedby the U.S. Geological Survey and cooperating State and Federal agencies in Idaho,adjacent States, and Canada.