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Fountain Street Bridge

Cambridge, Canada

The Fountain Street Bridge in Cambridge, Ontario, was a replacement project for the original bridge, built in 1957.

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Bridges
Construction Engineering
Transportation

Fountain Street Bridge

Cambridge, Canada

The Fountain Street Bridge in Cambridge, Ontario, was a replacement project for the original bridge, built in 1957.

The existing Fountain St. Bridge was a four-span continuous haunched concrete four cell voided slab bridge on wall piers. This project included the evaluation of the existing structure and assessment of various rehabilitation and replacement options, as well as preliminary and detailed design. Due to the condition of the structure and the difficulty in rehabilitating this type of structural system, the best option was found to be the replacement of the superstructure.

A new haunched steel girder sympathetic to the shape of the existing structure was used. The existing piers were rehabilitated and maintained for the new bridge, with rock protection added to protect from scour. New semi-integral abutments were constructed and set back further from the riverbanks to improve the hydraulic opening. To address the high water levels at the bridge, the new bridge and road profile were raised by 600 mm. Cultural heritage assessment and protection of the natural environment were also important aspects of this project. Contract administration and engineering services during construction were also part of this assignment.

location

Cambridge, Canada

Budget

$14 M

Role

Structural Engineering Consultant

Awards

2019 Award of Excellence, Consulting Engineers of Ontario

Client

Region of Waterloo

Span

150 m

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Challenge

The project included the conceptual and detailed schematic design of the demolition procedure for the existing concrete box structure over the Grand River. The bridge had to be carefully dismantled to avoid adversely affecting the river’s ecosystem.

Solution

Our team developed a demolition strategy that did not rely on access from the river in order to meet environmental restrictions on in-water work. The developed solution included a sequence of structure removal and stabilization. The implementation of this approach proved crucial when a flash flood of the Grand River brought water to the underside of the existing bridge during the demolition work.

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