The St. Clair Region Conservation Authority is keeping a flood watch in effect for Sarnia, Ontario, until March 16, 2026. This safety alert remains in place because a combination of melting snow and heavy rain has caused water levels to rise in local rivers and streams.
Between 20 and 40 mm of rain was forecast to fall across the region between the night of March 10 and March 11, 2026. This extra rainfall has landed on ground that is already soaked, which keeps smaller waterways over their banks and continues the risk of flooding in low-lying areas.
High water levels have already led to local road closures. As of March 10, 2026, officials closed Stanley Line in St. Clair Township between Kimball Road and Waubuno Road because the street was flooded.
Environment Canada previously issued a rainfall warning for the area, and conservation officials are still advising residents to stay away from the banks of all waterways. The ground near the water can be very slippery, and the fast-moving river water remains dangerously cold.
