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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Paddlers set to challenge the 64 km Mattawa River Race

June 11, 2025

Ninety-seven paddlers in 55 canoes, kayaks and stand-up paddleboards will be participating in the 64 km Mattawa River Race from Olmsted Beach, North Bay to the Mattawa Island Conservation area. An additional 15 participants will join the last 13km of the race leaving from Samuel de Champlain Provincial Park. The North Bay-Mattawa Conservation Authority’s Mattawa River Canoe Race is presented by Susan Weiskopf, Senior Financial Planner at IG.

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Floodplain Mapping is Now Complete

June 04, 2025

North Bay-Mattawa Conservation Authority (NBMCA), in collaboration with the Province of Ontario, the City of North Bay, and the Municipality of Callander, has completed a comprehensive update to floodplain mapping for several key watercourses in the region.

The completed mapping includes Chippewa Creek, Parks Creek, and Jessup’s Creek within the City of North Bay, and Lansdowne Creek in the Municipality of Callander.

 

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Flood Watch continues in Mattawa

May 13, 2025

A FLOOD WATCH remains in effect for the Mattawa River, downstream of Hurdman Dam to the Ottawa River.

“Water levels remain elevated in the lower reaches of the Mattawa River due to high flows from upstream tributaries to the Ottawa River. Flooding is expected to persist where it is already occurring ,” said Angela Mills, NBMCA Flood Duty Officer. “Water levels in the remainder of the watershed in local rivers have peaked and are near normal for this time of year.”

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FLOOD WATCH – Mattawa River downstream of Hurdman Dam

May 06, 2025

A FLOOD WATCH remains in effect for the Mattawa River, downstream of Hurdman Dam to the Ottawa River. The Watershed Conditions Statement – Flood Outlook previously issued for the remainder of the North Bay–Mattawa watershed has ended.

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