With a forecast of 15 to 35 mm of rain expected today, May 1, 2019 in the Ottawa River basin, water levels are expected to rise an additional 0.2 m and peak tomorrow, Thursday, May 2. Water levels are expected to be approximately 0.2 m higher than the May 2017 flood.

But South Nation Conservation says that due to the forecast uncertainty it is difficult to accurately predict how quickly water levels will rise and when river conditions may peak.

Water levels in Clarence-Rockland and Alfred-Plantagenet have risen 0.03 m over the last 48 hours.

Water levels along the lower Ottawa River are increasing due to spring runoff upstream in the Ottawa River basin. Runoff from snowmelt, precipitation and saturated soil has swollen most of the Ottawa River’s tributaries.

Water levels east of Cumberland Village (Boise Village, Morin Road, Leo Lane) are equal to levels reached in May 2017. Water levels are currently forecasted to rise an additional 0.20 m to 0.40 m above the 2017 levels.


All flood-prone areas along the Ottawa River from Lac Coulonge to the Montreal Archipelago are at risk. Peak water levels across many areas of the Ottawa River will exceed those experienced in May 2017 over the next couple days.

Levels will remain high and are forecast to peak between Thursday and Friday. Risk is highly dependent on the amount of precipitation received. Updates to all projections will be provided as they become available.

Residents in flood-prone areas are encouraged to closely monitor conditions and take necessary actions. Sandbags are available to residents in flood prone areas.

Residents are advised to stay away from watercourses where flows are high and where banks might be unstable. Parents are encouraged to explain dangers to children.

This Flood Warning is in effect until Saturday, May 4, 2019.

South Nation Conservation (SNC) and its Ottawa partners, the Rideau Valley and Mississippi Valley Conservation Authorities, monitor the water levels and weather forecasts with the Ministry of Natural Resources and Forestry as part of the Flood Forecasting and Warning Program. Updates are provided as conditions change.

The Ottawa River Regulation Planning Board will be reassessing forecast conditions and providing hydrological condition updates on its website daily at www.ottawariver.ca/forecast.php.

Please visit www.nation.on.ca for more information. To provide feedback with respect to changes in water related conditions please email [email protected], post on our Facebook (/SouthNationConservation) or Twitter (@SouthNationCA).

For more information regarding the Ottawa River, visit www.ottawariver.ca.