Significant amounts of rainfall are expected in the Ottawa River basin and in the Laurentians. Across the region, weather warnings are being posted for possible rainfall level of between 20 mm up to 50 mm of rain, beginning as early as Thursday, April 15 and continuing through Saturday. In many areas, a flood watch warning is in effect until Tuesday, April 23. South Nation Conservation says that water levels are not expected to rise to 2017 levels.

Clarence-Rockland issued a flood watch on April 17, reminding residents to take precautions to protect their property and to prepare emergency kits. Sand, bags and shovels are available for residents at the Jean-Marc Lalonde Arena parking lot, located at 1450 Du Parc Avenue in Rockland.

A note from South Nation Conversation says that the current snowpack throughout much of the Ottawa River basin remains at twice its normal depth for this time of the year.

Combined with spring runoff from the central and southern portions of the watershed, this precipitation is expected to cause a rapid and sustained increase in water levels and flows on the main stem of the Ottawa River.

Levels will exceed minor flood levels over the Easter weekend in flood prone areas along the Ottawa River at Lake Coulonge, Chats Lake, Britannia / Lac Deschênes, Pointe-Gatineau, Ottawa / Cumberland, Rockland, Thurso and other vulnerable areas down to the Montreal Archipelago.


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

 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

precautions to protect their property, such as:

  • Ensuring sump pump is clear, in good working condition and has a backwater valve on it.
  • Portable generator and backup pump.
  • Ensuring downspouts are clear and the outlet is at least 3 m from the dwelling.
  • Removing or securing items that might float away as flows increase.
  • Removing valuable items from basements or lower floors that could be subject to flooding.
  • Keep emergency phone numbers handy.
  • Familiarize yourself with your municipality’s emergency preparedness plan.


This statement is in effect until Tuesday, April 23, 2019.

SNC monitors the water levels and weather forecasts as part of the Flood Forecasting and Warning Program. Updates are provided as conditions change.

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