Forecast for 2023-05-01

River conditions forecasts posted on 2023-05-01 by Ottawa River Regulating Committee

Significant on-going rainfall over most of the Ottawa River basin is bringing additional water to the Ottawa River and causing levels and flows to rise in all locations along the main stem of the river. Levels are expected to peak in all locations over the next four days and should remain 45 cm to 1 metre below the historical levels of 2019 depending on locations. Levels in Mattawa and Pembroke have reached minor flood thresholds but are expected to remain below major flood thresholds. Levels are expected to exceed the major flood thresholds in Lake Coulonge, Chats Lake and Lake Deschenes. Please refer to the forecast section of our website for more information about the expected peak levels. Between Ottawa/Gatineau and the Montreal region, levels are expected to exceed the major flooding thresholds and to peak later this week. More details about forecasted peak levels is provided in our May 1 Press Release.