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Office Closed April 18-21, 2025

North Bay-Mattawa Conservation Authority

NBMCA was founded in 1972 by the Province of Ontario.
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.
NBMCA acknowledges that we are in Robinson-Huron Treaty territory, the Traditional Territory and Treaty Lands
of the Nbisiing Anishinaabeg, as well as the unceded and ancestral Traditional Territory
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. 

Get Outside!

Conservation Areas

Looking to hike, bike, or ski?
Paddle a historic canoe route?
Explore our natural heritage?
  

News

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November 28, 2023

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Watershed Conditions Statement - Flood Outlook and Water Safety

April 17, 2025

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).

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Snow Survey Readings for April 15

April 15, 2025

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. 

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Snow Survey Readings for April 8, 2025

April 08, 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.

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Water Safety Statement - April 4, 2025

April 04, 2025

A Watershed Conditions Statement – Water Safety remains in effect for the North Bay-Mattawa watershed.

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