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Centre Street Bridge flood barrier

 

Project Overview

The Centre Street Bridge has been an iconic fixture over the Bow River for over 100 years. During the 2013 flood the bridge proved to be a breach point for water into the downtown core.

To help reduce the flood risk to downtown Calgary, The City installed flood barriers (stop-log system) on the lower deck of the bridge, in 2018.

This completed project provides flood defense for adjacent communities and helps to protect citizens and infrastructure for years to come.

Partial funding for the Centre Street Bridge flood barrier project has been granted through the Alberta Community Resilience Program (ACRP) as part of the overall City of Calgary Flood Mitigation and Resilience Program.

Flooding into downtown in June 2013 via the lower Centre Street Bridge
 

Project details

Concrete foundations with embedded anchors for each stop-log gate were installed at each end of the lower Centre Street Bridge deck (roadway). Attachment points will be installed on the concrete bridge supports adjacent to the roadway.

During normal traffic flow, vehicles can drive on the concrete foundations, which are flush to the roadway.

The aluminum stop-log components are stored on site in sheds. During a flood event, City staff will install the posts and aluminum stop-logs to erect the two temporary gates and block the flood waters.

Similar technology is used to temporarily block the openings during a flood on the newly constructed zoo flood barrier and downtown west Eau Claire flood barriers.

The Centre Street Bridge lower deck flood barrier is one component of a larger flood mitigation plan for the Downtown Core, which also includes the West Eau Claire flood barrier and the Eau Claire Promenade flood barrier. The West Eau Claire park flood barrier extends from the Peace Bridge to Eau Claire Plaza and will be complete this fall. The Eau Claire Promenade barrier extends from Eau Claire Plaza, through the Centre Street Bridge, to Reconciliation Bridge and is currently in design with anticipated completion in 2021. Details on each of these projects can be found on the Eau Claire Public Realm Plan page.

Installation of aluminum stop-logs to temporarily block the opening in the west Eau Claire flood barrier
Completed installation of stop-logs to temporarily block the parking lot opening in the zoo flood barrier
 

Project Timeline

Construction is complete for the lower deck stoplogs and shed, as well as upper deck electrical maintenance. At the southeast corner of the bridge, a small earth berm was installed. Snow fence will remain until summer 2019 to ensure the site is restored. All pathways remain open in the area.

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