Allan’s Dam Rehabilitation Project

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About the project

The City of Guelph’s Engineering Services Department is undertaking the rehabilitation of the Allan’s Dam Spillway located under the Macdonell Street Bridge and the railway trestle area.

Drexler Construction Limited is undertaking the Allan’s Dam Rehabilitation project on behalf of the City of Guelph. Construction began in October 2012 and was expected to be completed by the end of November 2012. The work was postponed when the condition of the limestone rock in the arch section of the by-pass was found to be decomposed and water was flowing through the walls and creating a large sink hole north and west of the by-pass. This situation made it unsafe for construction activities to continue.

The solution was to place an arch corrugated metal pipe (CSP) in the stone arch section. The area around the CSP would be filled with concrete and reinforcing steel.

Project schedule

The City has been working with Grand River Conservation Authority (GRCA) to determine whether flows will be low enough by late June to restart construction. At the present time, based on the recent rain fall and weather conditions, GRCA is unable to reduce the current rate of water flow from Guelph Lake. Therefore, the City is unable to start the work as previously indicated. The City and GRCA are working together to monitor the water flows and will provide an update project schedule as soon as possible.

When the water flow is suitable, the work will start in the stone arch section of the by-pass and is expected to be completed in 3 weeks. The remainder of the project is expected to be completed within 4 to 6 weeks after the closing of the upper gate. The work will include the construction of a concrete wall, the installation of the main (lower) gate, the installation of the control building and final site restoration.

Until the project work is completed, the water level upstream of the project area will remain in its current lowered state.

For more information

Majde Qaqish, Project Engineer
Planning, Building, Engineering and Environment
519-822 -1260 extension 2225