The USACE weekly Georgian Bay (Lake Michigan-Huron) water levels: click here.
The USACE monthly Georgian Bay (Lake Michigan-Huron) water levels: click here.
LEVELnews: monitoring Great Lakes and St. Lawrence River water levels, From the Government of Canada. Click here.
The 12 month outlook summary for the Great Lakes in English units.
Georgian Bay, Lake Huron and Lake Michigan are connected hydrologically. Historic records show that water levels have fluctuated yearly based upon seasonal cycles and have, until recently, slowly moved between extreme highs and extreme lows over a 1.93m (6.33 feet) range. Although we all know that water levels go up and water levels go down, there are no discernable cycles in the existing dataset (that starts in 1918) showing longer term water level patterns -- this despite some adamant observers' opinions. In any case, the new conditions brought about by Global Warming mean that it is no longer your grandfather's Bay and previous observations are no longer reliable indicators of future conditions.
Fluctuations are important and necessary to our native plants and animals that have evolved and adapted to historic conditions in the upper Great Lakes. The competitive success of those plants at their favourite water levels ensures that there are a variety of plants that can provide shelter, protection and food for the large number of species that call these wetlands home. Climate change has disrupted these relationships, and impacted our own recreational activities in Georgian Bay.
What is the water level forecast for the next five years? Increasing variability and flashiness with a slight trend to higher average levels and wider range between highs and lows (as of December 2020).