Transport
Mt Crosby New Vehicle Bridge Project
Location
Mount Crosby, Queensland
Client
Seqwater
Status
Complete
About the project
BMD Constructions was engaged by Seqwater to deliver the Mt Crosby New Vehicle Bridge Project. The bridge was designed to provide a more flood-resilient route and deliver improved traffic flow over the Brisbane River in Mount Crosby.
Mount Crosby has been the epicentre of Brisbane’s water supply infrastructure for nearly 100 years. The project site alone included four elements listed on the Queensland Heritage Register - the existing Mount Crosby Weir Bridge, fish ladder, 1899 remnant bridge piers and water intake tower.
The Mount Crosby Weir Bridge - the existing road crossing for the local community - suffered extensive flood damage and was closed in May 2022. Our established presence on site meant we could efficiently and effectively commence repairs to the weir bridge while continuing to progress early works on the new vehicle bridge.
The bridge was officially opened to traffic by the Queensland Minister for Water, the Honourable Glenn Butcher MP.
Scope
New dual-lane bridge built 3 metres higher than the existing bridge and designed to better withstand and recover quicker from flooding
Relocating a major watermain connection between the East bank Pump Station and West Bank Water Treatment Plant
Remediation of the existing Mount Crosby Weir Bridge including replacing guardrail and resurfacing the road
Milestones
Temporarily de-watering the Brisbane River to create a safe in-river worksite by
Placing boards on the weir bridge to temporarily increase its height
Constructing a temporary levy bank downstream
Building a temporary water channel to connect the Brisbane River above the weir to the river below the weir
Pile drilling the new bridge’s foundations up to 18 metres deep into the Brisbane River’s bed
Placing 120 individual deck sections measuring 27 metres each and weighing 33 tonnes
Outcomes
This project forms a key part of Seqwater’s East Bank Flood Resilience Program (EBFRP), which focuses on mitigating the flood risks to essential infrastructure and renewing vital assets, while paying tribute to the rich cultural heritage of the area. The new vehicle bridge:
- is 187 metres long and 9 metres wide
- is 3 metres higher than the original bridge, 15 metres above the riverbed
- has a combination of steel and concrete in its guardrail design
- created 30 jobs throughout construction
- comprises more than 2220 cubic metres of concrete and 400 tonnes of steel reinforcement
- took 120,000 work hours to construct
- resulted in 53 items of potential cultural heritage significance being found and provided to Seqwater for review and cataloguing