SHORELINE CONDITIONS STATEMENT
FLOOD OUTLOOK – St. Lawrence River
A Flood Outlook Statement is being issued for areas along the St. Lawrence River shoreline in the South Nation Conservation jurisdiction.
Environmental Conditions:
Persistent precipitation this spring has resulted in rising water levels throughout the Great Lakes-St. Lawrence River basin. If near-average water supplies are received in the basin in the upcoming weeks, the International Lake Ontario-St. Lawrence River Board (ILOSLRB) forecasts that Lake Ontario levels may reach a seasonal peak between 75.40 m and 75.50 m in May or June. This seasonal peak is approximately 0.3 m to 0.5 m below the record highs of 2017 and 2019.
The ILOSLRB is closely monitoring conditions and frequently adjusting Lake Ontario outflows in accordance with Regulation Plan 2014.
Risks:
Levels in Lake Ontario influence levels in the upper St. Lawrence River, including areas along the shoreline in Maitland, Johnstown and Cardinal.
Water levels further downstream in the St. Lawrence River system will likely increase and remain at above average conditions for several weeks.
Although wide-spread flooding is not anticipated, municipalities and residents should be aware of higher-than-normal water levels and the potential for localized flooding in low-lying areas.
Residents are advised that strong winds may cause waves, further increasing water levels.
ACTION: Residents are advised to exercise extreme caution when near rivers and waterbodies due to increasing water levels and slippery conditions. Parents are encouraged to explain these dangers to their children.
Residents in flood prone or low-lying areas, historically susceptible to flooding, should take the necessary precautions to protect their property. Please ensure:
• Sump pump is clear, in good working condition and has a backwater valve on it.
• Easy access to portable backup generator and pump.
• Downspouts are clear and the outlet is at least 3 m from the dwelling.
• Driveway culverts are clear of debris and drain well.
• Securing items that might float away as flows increase.
Duration: This flood outlook statement is in effect until May 26th, 2026 at 5 PM or until an update has been issued.
SNC monitors the water levels and weather forecasts as part of the Flood Forecasting and Warning Program. Updates are provided as conditions change.
Please visit www.nation.on.ca for more information. To provide feedback with respect to changes in water related conditions please email waterwatch@nation.on.ca, post on our Facebook (/SouthNationConservation) or Twitter (@SouthNationCA).
FOR MORE INFORMATION: Phillip Dagenais, Water Resources Specialist; 1-877-984-2948, pdagenais@nation.on.ca.
Forwarded to: All Flood Forecasting and Warning Directory
