Lake St. Martin Channel Project

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Ranking for 2019: 83

Industry Sector: Other

Specific Sector: Water-Wastewater

Range: $500,000,000 - $1 billion

Project Value: $540,000,000

Federal: $247.5 million

Provincial: $292.5 million

Government Funds Involved: From the Government of Manitoba: Cost-share with Infrastructure Canada (INFC) as part of the Disaster Mitigation Adaption Fund (DMAF). Agreement-in-principle signed with INFC to cost share up to $247.5M of the total project cost.

Funding Source: Public

Location: Interlake, Manitoba

Estimated End Date of Substantial Completion:

LEED: Certification


In 2011, southern Manitoba experienced widespread flooding and Lake Manitoba experienced excessively high inflows through the Waterhen River, Whitemud River, and the Portage Diversion. This flood protection project is intended to improve lake level regulation and consequently reduce the likelihood of flooding along Lakes Manitoba and St. Martin. The $540-million flood protection project consists of two 23-kilometre long outlet channels with associated control structures and bridge crossings as well as an 80-kilometre all-weather access road and a 24kV transmission line to the Lake St. Martin outlet channel control structure. The Lake Manitoba outlet channel will connect Watchorn Bay on Lake Manitoba to Birch Bay on Lake St. Martin and the Lake St. Martin outlet channel will drain Lake St. Martin from a point in the southeast to Willow Point in Lake Winnipeg. Two sections of the all-weather access road are currently under construction, with an anticipated completion in 2019. Outlet Channel construction is scheduled to commence in 2020. Manitoba recognizes its duty to consult with Indigenous peoples in a meaningful way. The engagement and consultation process is currently underway, with 31 Indigenous communities identified as having the potential to be affected by the project.


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