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Office Closed April 18-21, 2025
North Bay-Mattawa Conservation Authority
As a community-based, non-profit environmental organization, NBMCA is dedicated to
conserving, restoring, developing and managing renewable natural resources on a watershed basis.
NBMCA is one of 36 Conservation Authorities who are members of Conservation Ontario.
of the Algonquin People and the Metis Nation.
Want to honor a Watershed Champion?
Boardwalk of Champions
Our watershed overflows with champions, people whose actions - big and small - have contributed to the health and well-being of our families, our neighbourhoods, our communities, our environment and our watershed.
Permits
Development and On-site Sewage
Permits are one tool for balancing human needs with the needs
of the natural environment, protecting people and property
from natural hazards.
Science
Integrated Watershed Management
From water quality monitoring and flood forecasting to drinking water source protection, NBMCA uses science to make watershed management decisions.
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Conservation Areas
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Paddle a historic canoe route?
Explore our natural heritage?
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MoreWatershed Conditions Statement - Flood Outlook and Water Safety
A Watershed Conditions Statement – Flood Outlook has been issued for the North Bay-Mattawa watershed and Watershed Conditions Statement – Water Safety has been issued for the Lake Nipissing Shoreline in North Bay and Callander and the lower reaches of the Mattawa River in Mattawa, according to the North Bay-Mattawa Conservation Authority (NBMCA).
MoreSnow Survey Readings for April 15
The snow depth has decreased by 18.8 cm and snow water equivalence decreased by 55.0 mm since April 8, reports the North Bay-Mattawa Conservation Authority who measures snow depth and water content as part of its Flood Forecasting and Warning Program.
MoreSnow Survey Readings for April 8, 2025
The snowpack has decreased by 5.1 cm while the snow water equivalence has decreased by 21.3 mm since the previous snow survey on April 1, 2025, reports the North Bay-Mattawa Conservation Authority (NBMCA) who measures snow depth and water content as part of its Flood Forecasting and Warning Program.
MoreWater Safety Statement - April 4, 2025
A Watershed Conditions Statement – Water Safety remains in effect for the North Bay-Mattawa watershed.
More