
A Flood Warning has been issued for most of the North Bay – Mattawa watershed and a Watershed Conditions Statement – Water Safety continues for the Lake Nipissing Shoreline and Mattawa River downstream of Hurdman Dam.
“Preliminary data indicate more than 50 mm of rain has fallen across the watershed today,” said Angela Mills, NBMCA Flood Duty Officer. “Month-to-date, more than 110% of normal April precipitation has been recorded at the North Bay Airport.”
Water level on Chippewa Creek has risen by more than 130 cm, Wasi River has risen more than 35 cm, La Vase River has risen by more than 55 cm, Turtle/Trout Lake has risen by 13 cm, Lake Nosbonsing has risen by 5 cm, Lake Talon has risen by more than 30 cm, and Mattawa River below Boullion Lake has increased by more than 28 cm since Sunday (Apr 12). Trails at the Corbeil Conservation Area are closed due to flooding.
Forecasts indicate temperatures will remain above freezing for the coming week with daytime highs for most days above 10 ºC. Significant and continued rainfall is anticipated for the coming week with 30-60 mm cumulative rain forecast.
Water level and flows on local creeks and rivers will continue to increase in response to the forecasted rain and resulting snowmelt as the water drains through the landscape.
The public is encouraged to keep children and pets away from watercourses and shorelines. Residents should be aware that water levels and flows in local streams and rivers, particularly in urban areas, can change rapidly during and after rainfall events. Banks adjacent to rivers and creeks are very slippery at this time and when combined with fast moving cold open water, pose a serious hazard. Flooding and ponding are likely in flood-prone low-lying areas. For flood emergencies, contact your local municipality. Residents of unincorporated townships should contact the Ministry of Natural Resources – North Bay District.
NBMCA staff will continue to monitor weather and watershed conditions as part of the Authority's Flood Forecasting and Warning Program and will update this message as needed. Staff remain in contact with municipalities and other partners as required.
Current flood status and condition updates are available at nbmca.ca. This statement is also distributed to local media and posted on X (@theNBMCA), Facebook (@theNBMCA), and Instagram (@nbmcainfo).
This message is in effect until Monday, April 20, 2026, at 4:00 PM EDT.
Note: The North Bay-Mattawa Conservation Authority is responsible for local flood forecast and warning programs for residents who live within the jurisdiction, including those in North Bay and Callander to Mattawa. Where a Conservation Authority has not been established, the local MNR District Office is responsible for local Flood Forecast and Warning programs, including along the Ottawa River, see MNR Flood Forecast and Warning.
CONTACT:
Angela Mills, Flood Duty Officer, cell: 705-497-4668
Paula Loranger, Community Relations Coordinator, cell: 705-494-5115