The water levels in the graphic shown below are average annual water levels recorded since 1860; the first year of systematic data gathering. These levels are given in meters above International Great Lakes Datum, 1985 (IGLD 1985).
Sources of Information
For a comparison with present, or recent, lake levels, visit Forecast Lake Levels. At this site, select Weekly Great Lakes water levels forecast or the Monthly Bulletin of lake levels for the Great Lakes