The 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 forecasted rain and potential thunderstorms for today (June 30). Significant water safety concerns, as well as localized watercourse flooding of low-lying areas that typically flood during higher water levels, is expected.
Significant watercourse flooding also has the potential to occur.
There is considerable uncertainty as to the amount of rain and runoff that will occur. HCA staff continue to monitor watercourse, watershed, and weather conditions closely.
A close watch on local conditions is recommended. Also, HCA wishes to remind residents to use 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 at this time.
Today (June 30), the Hamilton area is expected to receive between 0 and 45 mm of total rain (this includes 0 to 20 mm of rain, with an additional 5 to 25 mm possible if thunderstorms occur). On Tuesday (July 1), the Hamilton area is expected to receive between 0 and 11 mm of rain (this includes 0 to 1 mm of forecasted rain, with an additional 5 to 10 mm possible if thunderstorms occur). Then on Wednesday (July 2), the Hamilton area is expected to receive between 0 and 17 mm of total rain (this includes 0 to 7 mm of rain, with an additional 5 to 10 mm possible if thunderstorms occur).
Current water levels and flows in Spencer Creek watercourses are elevated and near or above thresholds for significant water safety concerns. Significant water safety concerns and localized watercourse flooding of low-lying areas that typically flood during higher water levels is expected to be occurring currently in Upper Spencer Creek. In other watercourses, water levels are near baseflow conditions and do not pose significant water safety concerns nor significant watercourse flooding concerns.
This message is in effect until Wednesday, July 2, 2025 at 4:30 PM, by which time it will either be updated or cancelled. HCA will issue updates prior to July 2 as needed.
There are no other active messages at this time.
For further information or questions regarding this message, please contact:
Jonathan Bastien, Water Resources Engineer
Phone: 905-525-2181 ext 138
Jonathan.Bastien@conservationhamilton.ca
