Great Lakes Water Levels NOAA, Great Lakes Environmental Research Laboratory (GLERL) Includes historical hydrographs illustrating monthly water levels 1860-present, as well as information about the current situation and the year's outlook.
Historic Great Lakes Levels U.S. Army Corps of Engineers (USACE), Detroit District Use this page to produce a tabular or graphical report of historic average monthly water levels for a selected lake in the Great Lakes region over a specified time period.
Previous Month's Daily Lake Averages U.S. Army Corps of Engineers (USACE), Detroit District Select current or 1-3 months previous to view a table depicting the month's daily lakewide average levels in feet or meters.
Recent and Forecasted Water Levels on the Great Lakes Department of Fisheries and Oceans (DFO), Canadian Hydrographic Service Includes average monthly water levels for the previous year and the current year to date. Period of record is 1918-1996. Elevations are in meters referred to chart datum and IGLD (1985).
St. Lawrence River Level Bulletin U.S. Army Corps of Engineers (USACE), Buffalo District Consists of graphs showing past, present and predicted monthly average water levels along the St. Lawrence River.