Major construction is hitting Slacks Creek over the next four weeks as the widening of Ray Hodgson Bridge begins.
The upgrades will see an additional north-bound traffic lane on the bridge, and a footpath and bikeway.
To support this extra weight, eight piles of up to seven metres will be poured into the bedrock under Slacks Creek.
Steel liners will be driven into the ground to the full depth of the piles, before the earth is drilled out from inside each liner.
The steel-reinforced piles will then be poured into the excavated holes.
Construction of what will be a 70-metre bridge is expected to finish in mid-2024.
The bridge is named after former Logan mayor Ray Hodgson, who served from 1990 to 1991.
The project is part of a broader $77.7 million upgrade of Loganlea Road, stretching from Meadowbrook to the M1.
The road will be widened to six lanes from University Dr at Meadowbrook to the M1 at Slacks Creek.
Below the surface, extensive new drainage and almost 2km of electricity lines have been installed to improve safety, flood resilience and visual appeal.
$55.2 million is coming from Logan City Council, and the other $22.5 million is coming from the federal government.
Local councillor Mindy Russell said the bikeway and footpath would be well used.
“This work is unlocking Logan’s potential, and I’m looking forward to seeing the extra pedestrian and bike riding opportunities it will also open up,” Cr Russell said.
Council’s infrastructure chair, councillor Teresa Lane, said the disruption to traffic, residents and businesses would be minimal, despite the complexity of bridge-building.
“The benefits will be huge,” Cr Lane said.
“The city will undergo some tremendous growth in coming years, and it’s crucial we have a roads network to cope and get drivers home quicker and safer.”
Federal infrastructure minister Catherine King said the work would have an impact on locals.
“The Australian government is proud to be jointly funding this vital bridge-widening project for Logan, delivering on our election commitments and making a real difference for the community,” Ms King said.
“Projects like this ensure our road networks support residents to get home safely from each trip while keeping freight connected to our cities and regions.”
