FLOOD WATCH – Inland Lake and River Flooding: September 2

Hamilton Conservation Authority (HCA) is advising that water levels and flows in all watercourses within the HCA watershed are expected to increase significantly, as a result of the rain and potentially strong thunderstorms forecasted for the rest of today (September 2).

Significant watercourse flooding has potential to occur. In addition, significant water safety concerns, as well as localized watercourse flooding of low-lying areas that typically flood during higher water levels, are expected to occur.

There is considerable uncertainty as to resulting watercourse conditions, given the relatively large range of combined rain and thunderstorm amounts that are forecasted. As such, HCA staff continue to monitor watercourse, watershed, and weather conditions closely.

Safety Reminder
A close watch on local conditions is recommended. Also, HCA wishes to remind residents to exercise caution near all water bodies and structures such as bridges, culverts and dams during this time. Above normal water levels, faster moving water, rapidly changing levels and flows, and slippery banks may pose significant hazards. Adults are advised to keep children and pets away from water bodies currently.

Current Conditions
Current water levels and flows are slightly elevated above baseflow conditions. Currently, there is no significant watercourse flooding, nor any significant water safety concerns in any watercourses.

Rainfall Forecast
Over the rest of today (September 2), the Hamilton area is expected to receive between 2 and 70 mm of total rain (this includes 2 to 20 mm of rain, with an additional 25 to 50 mm possible if strong thunderstorms occur).

This message is in effect until Thursday, September 3, 2026 at 4:30 pm, by which time it will either be updated or cancelled. HCA will issue updates prior to September 3 as needed.

For further information or questions regarding this message, please contact:

Jonathan Bastien
Manager, Water Resources Engineering
905-525-2181 ext 138
jbastien@conservationhamilton.ca