South Nation Conservation works with its partner municipalities along the South Nation, St. Lawrence and Ottawa Rivers to provide advanced notice of flooding and low water conditions through the provincial Flood Forecasting and Warning and Low Water Response programs.
MAPPED ROAD CLOSURES, FLOODED AREAS AND SANDBAG LOCATIONS
VIEW WATER LEVELS IN SOUTH NATION WATERSHED
Current Watershed Conditions, Flood, and Drought Messages:
May 16, 2025
WATER SAFETY STATEMENT - Lower Ottawa River (Arnprior to Hawkesbury)
This WATER SAFETY STATEMENT is an update to the Flood Watch statement issued May 9, 2025, for areas along the Lower Ottawa River (Arnprior to Hawkesbury).
Water levels remain elevated along the mainstem of the Ottawa River due to recent snow melt and rainfall events. The northern part of the basin is now snow free and water levels are expected to continue to slowly decrease over the coming weeks. The river will remain sensitive to widespread rainfall events.
Residents are advised to exercise caution when near rivers and waterbodies due to elevated levels and flows and slippery conditions. Parents are encouraged to explain these dangers to their children.
Residents in flood-prone areas are encouraged to monitor conditions and continue necessary precautions:
- Ensure sump pumps are clear, in good working condition and have a backwater valve.
- Maintain easy access to a portable backup generator and pump.
- Keep downspouts clear and directed at least 3 m away from homes.
- Confirm driveway culverts are clear of debris and draining well.
- Secure loose items that could float away as flows increase.
The Mississippi Valley, Rideau Valley, and South Nation Conservation Authorities continue to monitor conditions alongside the Ministry of Natural Resources under Ontario’s Flood Forecasting and Warning Program. Updates will be provided as conditions change.
For current Ottawa River conditions and forecasts, visit: https://ottawariver.ca/conditions
For provincial flood warnings, visit: www.ontario.ca/law-and-safety/flood-forecasting-and-warning-program
This WATER SAFETY STATEMENT is in effect until May 30, 2025, at 5:00 PM.
South Nation Conservation
Kat Watson, Coordinator, Early Warning Systems and Watershed Plans kwatson@nation.on.ca | 1-877-984-2948
Definitions:
- Water Conditions Statement: Water Safety: indicates that high flows, melting ice or other factors could be dangerous for such users as boaters, anglers, and swimmers but flooding is not expected.
- Water Conditions Statement: Flood Outlook: gives early notice of the potential for flooding based on weather forecasts calling for heavy rain, snow melt, high winds, or other conditions.
- Flood Watch: potential for flooding exists within specific watercourses and municipalities. Municipalities, emergency services and individual landowners in flood-prone areas should prepare.
- Flood Warning: flooding is imminent or occurring within specific watercourses and municipalities.
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Flood Forecasting and Warning 2025 Summary:
Past Statements:
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2017 Watershed Conditions and Flood Messages
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2018 Watershed Conditions and Flood Messages
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2019 Watershed Conditions and Flood Messages
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2020 Watershed Conditions and Flood Messages
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2021 Watershed Conditions and Flood Messages
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2022 Watershed Conditions and Flood Messages
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2023 Watershed Conditions and Flood Messages
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2024 Watershed Conditions and Flood Messages