Forecast for 2025-04-27

Flows and water levels on the main stem of the Ottawa River continue to rise due to increased runoff from recent rainfall combined with snowmelt from the mountainous areas of the basin. Minor flood levels have been reached in some flood prone areas along the river. Levels may reach or exceed the major flood level from Lake Coulonge to Lake Deschenes depending on the rapidity of snowmelt and forecast precipitation over the next few days. From Gatineau (Hull Marina) down to the Montreal Region, levels are expected to exceed minor flood levels but should remain below major flood levels. Our website Forecasts section provides expected water levels over a four-day horizon in your area. Levels are expected to peak starting Wednesday-Thursday between Lake Coulonge and Lake Deschenes, and starting Thursday-Friday from Gatineau down to the Montreal Region. Uncertain weather factors play into estimating peak levels. On April 27 peak level estimates are: Lac Coulonge (108.35 m), Chats Lake (75.40 m), Lake Deschenes (60.00 m), Gatineau -Hull marina (43.75 m) and Thurso (42.35 m).