Flood Watch: Ottawa River Expected to Peak at Major Levels

The Ottawa River is hitting critical thresholds this week as the spring freshet reaches its height. As of Monday, April 20, 2026, residents from Pembroke to Montreal should prepare for significant water levels as the system plateaus.

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Key Forecast Details

Current projections from the Ottawa River Regulating Committee indicate that levels in several areas will surpass major flood thresholds today and tomorrow.

• Regional Peak: Areas between Lac Coulonge and Carillon (including Gatineau and Ottawa’s west end) are the most at risk.
• Historical Context: Levels at Lake Deschenes and the Gatineau-Hull marina are forecast to be roughly 40–60 cm higher than last year’s peaks.
• Current Impact: Over 160 homes in the Gatineau region are currently threatened, with dozens of street closures already in effect.

Status Summary by Region

Region	Warning Level	Outlook
Pembroke to Arnprior	Flood Warning	Levels remain high through Wednesday.
Ottawa / Gatineau	Major Flooding	Peak levels expected Monday/Tuesday.
Arnprior to Hawkesbury	Flood Watch	Major thresholds may be exceeded today.

Safety & Preparation

Local authorities are urging residents in flood-prone zones to take immediate action:

1. Protect Your Home: Clear sump pump drains and move all shoreline equipment or furniture to higher ground.
2. Exercise Caution: Stay well back from riverbanks, as high flow rates make edges unstable and dangerous.
3. Stay Informed: Check the Ottawa River Regulation Planning Board (ORRPB) for the most recent 4-day forecast updates.

States of emergency have already been declared in nearby communities like West Nipissing and Minden Hills. If you reside in a low-lying area, ensure your emergency kit is accessible in the event of an evacuation order.