UPDATE #5: Flood Watch maintained in Upper Watershed in face of elevated water levels, rainy forecast

(WCS – R09/2025)

A Flood Watch is being maintained within the Rideau Upper Watershed lakes due to continuing elevated water levels and flows. With the recent rainfall and melt, limited capacity remains to absorb further runoff, which increases the risk of localized flooding in low-lying areas (especially around Bobs Lake and Christie Lake).

Residents are still strongly encouraged to remain vigilant, monitor local conditions, and take necessary steps to protect their properties. Please refer to the recommended actions and safety measures provided below.

Weather Forecast: Environment and Climate Change Canada is forecasting moderate rainfall across the watershed over the weekend, with accumulations ranging from 10-30 mm, and the potential for isolated thunderstorms which could result in locally higher amounts. Additional rainfall is expected into next week, with the possibility of an additional 7-10 mm. 

Environmental Conditions: Water levels and flows across the Upper Rideau Valley watershed remain elevated due to recent melt and rainfall. Reservoirs in the upper watershed are stabilizing but remain elevated, with limited capacity to absorb further runoff. Additional rainfall may prolong or exacerbate this elevated state and could result in sustained flooding in low-lying areas. Based on the most recent snow surveys, no significant snowpack remains within the Rideau Valley watershed, however soils are saturated and may still be responsive to further rainfall.

Risks: The Upper Watershed lakes are under a Flood Watch, based on the following factors:

• With limited capacity within the upper reservoirs, water levels are expected to remain elevated and may result in further flooding within low-lying areas

Location-Specific Considerations: Due to the recent rain/melt, water levels in the Upper Watershed, especially at Bobs Lake and Christie Lake remain elevated, which may prolong or exacerbate flooding in low-lying areas. Parks Canada staff are closely monitoring conditions and adjusting operations as needed to manage water levels between the lakes. Residents in low-lying areas near Bobs Lake and Christie Lake, which have historically been prone to flooding, should continue to take necessary precautions to protect their property.   

Action & Safety Recommendations: Residents in flood-prone areas are advised to closely monitor water levels and flows and take the necessary precautions to protect their property, such as:

• Ensuring sump pumps are clear, in good working condition, and have a backwater valve.
• Keeping a portable backup generator and pump easily accessible.
• Ensuring downspouts are clear and directing water at least 3 m away from the dwelling.
• Securing items that might float away as flows increase.
• Removing valuable items from basements or lower floors that could be subject to flooding.
• Keeping emergency phone numbers handy.
• Familiarizing yourself with your municipality’s Emergency Preparedness Plan.

Duration: This Flood Watch is in effect until May 2 at 11:59 pm or until an update has been issued.

RVCA monitors water levels and weather forecasts as part of its Flood Forecasting and Warning Program. Updates will be provided as conditions change.

Water Safety – High flows, unstable banks, melting ice or other factors that could be dangerous for recreational users such as anglers, canoeists, hikers, children, pets, etc. Flooding is not expected.

Flood Outlook – Early notice of the potential for flooding based on weather forecasts, calling for heavy rain, snow melt, high winds or other conditions that could lead to high runoff, cause ice jams and/or lakeshore flooding or erosion.

Flood Watch – Flooding is possible in specific watercourses or municipalities. Municipalities, emergency services and individuals in flood prone areas should prepare.

Flood Warning – Flooding is imminent or already occurring in specific watercourses or municipalities.