Forecast for 2025-05-02

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 most flood prone locations between Mattawa and Lake Deschenes. Levels may reach or exceed the major flood level in Mattawa and from Lake Coulonge down to Lake Deschenes depending on the speed of snowmelt and precipitation to be received early next week. From Gatineau (Hull Marina) down to Hawkesbury / Grenville, 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. Uncertain weather and hydrological factors play into estimating peak levels. On May 2, peak level estimates are: Mattawa (154.65 m), Pembroke (113 m), Lac Coulonge (108.3 m), Chats Lake (75.3 m), Lake Deschenes (59.95 m), Gatineau -Hull marina (43.8 m) and Thurso (42.40 m).