Water-resources data for the 1998 water year for North Dakota consists of records of discharge, stage, and water quality for streams; contents, stage, and water quality for lakes and reservoirs; and water levels and water quality for ground-water wells. Volume 1 contains records of water discharge for 97 streamflow-gaging stations; stage only for 22 river-stage stations; contents and/or stage for 12 lake or reservoir stations; annual maximum discharge for 32 crest-stage stations; and water-quality for 99 streamflow-gaging stations, 3 river-stage stations, 9 lake or reservoir stations, and several miscellaneous sample sites on streams and lakes. Also included are water-quality data for 2 precipitation-chemistry stations. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating Federal, State, and local agencies in North Dakota.