FLOOD WARNING: Ottawa River – Arnprior to Hawkesbury – Update #11

14-May-2019 14-May-2019

Weather Forecast:
Rainfall of 10 to 15 mm is forecasted today, May 14. An additional 5 to 10 mm of rain is forecasted tomorrow, May 15, 2019.

Environmental Conditions:
Water levels along the lower Ottawa River from Chats Lake to the Grenville/Hawkesbury area have stabilized and will slowly recede in the coming weeks.

All flood-prone areas along the Ottawa River from Lac Coulonge down to the Montreal Archipelago are at risk as snowmelt continues along the upper Ottawa River.

Levels are expected to remain high for the next two to three weeks.

Risk is highly dependent on the amount of precipitation that is received.

Due to the forecast uncertainty it is difficult to accurately predict how quickly water levels will rise and when river conditions may peak.

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 strongly urged to keep sandbags in place for at least the next two weeks.

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 Friday, May 17, 2019 at 5:00 PM.

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

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

For more information regarding the Ottawa River, visit

FOR MORE INFORMATION: Omar Kana’n, SNC Water Resources Analyst,

FOR MEDIA INQUIRIES: John Mesman, SNC Team Lead of Communications,

FORWARDED TO: All Flood Forecasting and Warning Directory