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Lake Simcoe Region Conservation Authority

Skip Navigation LinksLake Simcoe Region Conservation Authority > Flood Forecasting - Lake Simcoe Shoreline

​Lake Simcoe Shorelin​e

Water Levels and Shoreline Flooding

The Lake Simcoe S​horeline Hazard Watch and Warning messages are issued when there is a potential for high water levels and waves along the Lake Simcoe Shoreline that could lead to flooding and erosion. The shoreline hazard warning can be issued with, or independent of, the riverine flood messages.

Lake Simcoe Shoreline Hazards - Definitions

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​​Normal Conditions

No flood conditions exist.

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Low Risk​​:

  • potential for minor localized shoreline flooding due to high lake levels with minimal impact or disruption
  • minor local drainage issues​​

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​Shoreline Hazard Watch - Moderate Risk

  • broader shoreline flooding due to high lake levels
  • impacts to local drainage in low lying areas due to high lake levels and inability for effective drainage
  • localized minor storm surge / seiche and wave damage may occur
  •  moderate risk to dike failures in the Keswick, Kolbar and Bradford polders impacting agricultural lands

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Shoreline Hazard Warning - High Risk

  • significant shoreline flooding due to extreme lake levels
  • significant storm surge/seiche causing flooding in low lying shoreline areas exposed to prevailing winds
  • high risk for dock, boathouse and shoreline damage for areas exposed to prevailing winds
  • high risk to dike failures in the Keswick, Kolbar and Bradford polders impacting agricultural lands

​Riverine Flooding

Lake Simcoe Conservation Authority also issues riverine messages to advise municipalities and watershed residents of the potential threat to public safety or property damage. 

Learn more about our Riverine (rivers and streams) flood forecasting.​