Lake Ontario Shoreline Status

Conservation Halton Terminates Flood Watch for Lake Ontario Shoreline & Issues a Watershed Conditions Statement – Water Safety for Lake Ontario Shoreline

Date: Friday August 23, 2019 @ 10:00 AM

The latest information provided by the International Lake Ontario - St. Lawrence River Board (ILOSLRB) confirms a mean daily water level of 75.49 m as of August 22, 2019. This is 43 cm below this year’s peak of 75.92 m last recorded on June 15th but 63 cm above average. Lake Ontario remains above the level at this same time in 2017, but is now 7 cm below the record high for this time of year, which was set in 1947.

Lake Ontario levels are expected to continue to decline in the coming weeks but still remain above the long term average for this time of year.

Conservation Halton is asking all residents and children to keep a safe distance from locations in proximity to the shoreline. Elevated water levels, high sustained wind gusts and the potential for waves to overtop breakwalls and other shoreline structures continue to make these locations dangerous. Please alert children in your care of these imminent dangers.

Conservation Halton will continue to monitor Lake Ontario wind conditions and lake levels closely and will issue further messages as necessary.

This Watershed Conditions Statement – Water Safety for Lake Ontario Shoreline will be in effect through Friday September 6, 2019.

Additional information is available online through the ILOSLRB website and on Facebook:
Current Conditions:

For further information or questions regarding this message contact:
Glenn Farmer, Flood Duty Officer
(905) 336-1158 x2290
Robin Ashton
Manager, Marketing Services
905-336-1158 x2248
Note: A Shoreline Hazard Warning is defined as a notice that critical high water levels and waves are imminent and/or occurring, which could result in shoreline flooding and/or erosion.


Conservation Halton Flood Terminology

The current terminology was adopted by Conservation Halton, other Conservation Authorities across Ontario and the Ontario Ministry of Natural Resources and Forestry (OMNRF) in February, 2012. The change is to ensure flood messages are consistent and in line with severe weather terminology used by other agencies such as Environment Canada and the Weather Network. The terms were developed by a committee of representatives of Conservation Authorities, Conservation Ontario, the Ministry of Natural Resources and Forestry, Environment Canada, and other agencies
The following is the flood and water safety message terminology used by Conservation Halton:

Conditions are within normal limits. No flooding is expected.


Watershed Conditions Statement:
A general notice of weather conditions that could pose a risk to personal safety or which have the potential to lead to flooding. There are two variations of these:

Watershed Conditions Statement - Water Safety:
High flows, unsafe banks, melting ice, or other factors could be dangerous for recreational users such as anglers, canoeists, hikers, children, pets, and others. Flooding is not expected
Watershed Conditions Statement - Flood Outlook:
Early notice of the potential for flooding based on weather forecasts calling for heavy rain, snow melt, high wind, or other conditions that could lead to high runoff and cause ice jams, lakeshore flooding, or erosion.
Flood Watch:
Flooding is possible in specific watercourses or municipalities. Municipalities, emergency services, and individual landowners in flood-prone areas should prepare;
Flood Warning:
Flooding is imminent or already occurring in specific watercourses or municipalities. Municipalities and individuals should take action to deal with flood conditions. This may include road closures and evacuations.