Timiskaming Dam Complex: Ontario dam replacement project

From: Public Services and Procurement Canada

Learn about the Timiskaming Dam Complex and the project to replace the Ontario dam.

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Project overview

Timiskaming, Ontario
Locate the Ontario portion of the Timiskaming Dam Complex on a map
Type of project
Replacement of the Ontario portion of the Timiskaming Dam Complex
Lead department
Public Services and Procurement Canada
Construction firms
Hatch Inc. (engineering design contract)
North America Construction Inc. (construction contract)
$32.9 million
Project status
Completed in March 2017

Project description

The Ontario portion of the Timiskaming Dam Complex, located 65 kilometres northeast of North Bay, Ontario, was more than a century old and needed to be replaced. Located on either side of Long Sault Island on the Ottawa River, the complex comprises 2 structurally independent dams: the Ontario dam and the Quebec dam.

These dams control the water level in Lake Timiskaming upstream and the flow of the Ottawa River downstream. They also control the last major reservoir on the Ottawa River upstream of the St. Lawrence River at Montréal and provide water storage for hydroelectric generation downstream.

The complex is an important interprovincial road for motorists, cyclists and pedestrians, and it accommodates a natural gas pipeline.

The new Ontario dam was constructed immediately downstream from the original.

View enlarged image of the Ontario dam of the Timaskaming Dam Complex

Key milestones

The replacement of the Ontario portion of the dam was part of a five-year work plan.

Construction was completed on March 31, 2017.

Project background

Find out more about the project to replace the Ontario portion of the Timiskaming Dam Complex.

Reduced flooding risk

Public Services and Procurement Canada had a water management plan to ensure that water levels were within normal levels during the construction period. During the replacement of the Ontario dam, the Quebec dam was used for water management.

Local traffic

All vehicles continued to use the previously existing road (old dam) during construction.

Changes were made to the road that crosses the dam:

Boat launch

The boat launch remained accessible to the public during and after construction.

The boat launch is not owned or operated by the Government of Canada. No work was performed on that facility.

Recreational fishing

Recreational fishing is known to take place at the Ontario dam, but during construction, fishing was restricted due to safety considerations. Restrictions are no longer in effect.

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