Forecast for 2023-04-30

River conditions forecasts posted on 2023-04-30 by Ottawa River Regulating Committee

Significant rainfall is expected over most of the Ottawa River basin beginning Sunday evening and continuing into Wednesday. Runoff from this rainfall will raise river levels above what was experienced last week along the main stem of the river. Principle reservoirs are being managed to reduce river flows in downstream areas. Levels in Mattawa are expected to exceed the minor flood threshold over the coming days. Levels in the Pembroke area are expected to approach the major flooding threshold over the coming days. Levels on Lake Coulonge are already above the major flooding threshold and are expected to rise higher over the coming days. Chats Lake and Lake Deschenes levels are expected to exceed their major flooding thresholds over the coming week. Flood prone areas between Ottawa/Gatineau and the Montreal area are expected to experience minor flooding. Forecasts indicate that levels in all locations along the main stem of the Ottawa River will remain below historic flood levels. For more information, read the April 28 Press Release.