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Lake Ontario is a great lake with management context from International Joint Commission / Great Lakes-St. Lawrence regulation; USACE & ECCC monitoring. Lake Insights displays its latest available elevation from NOAA / U.S. Army Corps of Engineers (coordinated network).
1 foot above long-term average
+1.00 ft vs long-term average
Lake Ontario is currently 1 foot above long-term average and has risen slightly over the past week. The lake is above its long-term average and has continued to rise over the past week.
Waterbody / project type
General factors for Great Lakes
These are common influences for this type of lake. They do not identify the cause of a specific current change unless an operator update confirms it.
Basin water balance
Great Lakes levels respond to precipitation, runoff, evaporation, and connecting-channel flows across the basin.
Seasonal cycle
Levels typically rise in spring/early summer and fall later in the year, though the pattern varies by lake and year.
Managing authority: International Joint Commission / Great Lakes-St. Lawrence regulation; USACE & ECCC monitoring
Observation source used by Lake Insights: NOAA / U.S. Army Corps of Engineers (coordinated network)
Who manages the lake and who publishes the reading Lake Insights displays can differ. Lake Insights does not invent a source label from the managing authority alone.
Shared background — not lake-specific facts
Lake Insights aggregates water level information from authoritative public sources such as the U.S. Army Corps of Engineers, NOAA, TVA, Bureau of Reclamation, power utilities, and other official lake operators. We preserve historical observations, calculate trends, and present lake conditions in a consistent format. For NOAA / U.S. Army Corps of Engineers (coordinated network), we link to the official source whenever it is available. Lake Insights does not predict future lake levels unless an official forecast has been published by the managing authority.
Datum
Current-level source
Connecting channels
Flows through connecting channels and regulated outlets influence how water moves through the Great Lakes system.
Wind & seiches
Strong winds can temporarily raise levels on one shore and lower them on another (wind setup / seiche).