Welcome to NBMCA.ca

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 Watershed Conditions Statement – Water Safety

April 02, 2026

A Flood Outlook for most of the North Bay-Mattawa watershed, along with a Watershed Conditions Statement - Water Safety for the Lake Nipissing Shoreline and the Mattawa River downstream of Hurdman Dam, have been issued according to the North Bay-Mattawa Conservation Authority (NBMCA).

Snow Survey Readings for March 23

March 23, 2026

Snow survey measurements show a snow depth increase of 3.6 cm, and snow water equivalence increase of 9.3 mm from the last survey on March 18.

Snow Survey Readings for March 18

March 18, 2026

Snow survey measurements show a snow depth increase of 9.9 cm, and snow water equivalence increase of 39.7 mm from the last survey on March 9.

Watershed Conditions Statement – Flood Outlook - March 13

March 13, 2026

A Watershed Conditions Statement – Flood Outlook has been issued for the North Bay – Mattawa watershed, according to the North Bay-Mattawa Conservation Authority (NBMCA).