The sweeping rehabilitation of Chattanooga’s iconic Walnut Street Bridge remains on track for a September reopening after workers undertook one of the most extensive structural repair efforts in the bridge’s 136-year history.
City officials say the $47 million project required replacing and reinforcing enormous portions of the historic pedestrian bridge’s steel support system, a task made even more challenging by the structure’s age, location over the Tennessee River and historic significance. Yet despite uncovering far more corrosion than initially anticipated, the city says the bridge will reopen Sept. 26 without requiring additional local tax dollars.
Saving a Chattanooga landmark
The overhaul involved removing and replacing more than 200,000 pounds of steel – roughly equivalent to the weight of 43 Volkswagen Atlas SUVs. If laid end to end, the replacement beams would stretch 8,340 feet, approximately the height of 28 Republic Centre towers stacked atop one another or about six Empire State Building structures.
Mayor Tim Kelly says the city chose to fully address the bridge’s deteriorating structural conditions rather than postpone repairs.
“While it’s true that this is a historic bridge that has been sitting over the water for 136 years with all that entails, I refuse to kick the can down the road on projects of generational importance to our city’s well-being,” Kelly says. “In spite of the 94 tons of rusted steel beams we had to rip out and replace, I’m proud to report that the Walnut Street Bridge repair is on time and will not require additional city funds to complete.”
Much of the work centered on repairing the bridge’s aging load-bearing system. More than one out of every four structural steel beams had to be removed and replaced, while more than 90% of the bridge’s suspension trusses required extensive rehabilitation because of heavy rust where the components connect. Another 7% of the remaining load-bearing structures needed additional steel bracing to strengthen the bridge.
Crews performed all of that work while preventing debris, paint and metal from falling into the Tennessee River below. To accomplish that, contractors installed a chain-link work platform beneath the entire bridge, giving workers unprecedented access to areas that previously had been difficult or impossible to inspect closely.
Once the original decking was removed and the inspection platform installed, crews discovered far more corrosion underneath the bridge than engineers had initially identified in project plans. Those discoveries drove the project’s $12.6 million increase in costs, primarily tied to replacing and refurbishing additional corroded steel. City officials said the increase was absorbed entirely through additional federal grant funding rather than city funds.
Beyond the structural work, the rehabilitation project also modernized several portions of the bridge. Workers installed new weather-resistant wood decking, rewired the structure to support upgraded lighting and security cameras, repaired handrails and improved accessibility for residents with disabilities. The bridge has also been repainted in segments using what officials described as “Chattanooga blue.”
A bridge through history
The Walnut Street Bridge has long occupied a central place in Chattanooga’s history and identity. Constructed in 1890, the steel truss bridge was designed by noted bridge architect Edwin Thacher for the Smith Bridge Company of Toledo, Ohio. The structure spans the Tennessee River, linking downtown Chattanooga with the city’s North Shore.
Engineers designed the bridge using a Pennsylvania truss system, a subtype of Pratt truss known for its distinctive pattern of diagonal braces and triangular supports that provide additional strength for longer spans. Originally built for horse-drawn wagons and pedestrians, the bridge later accommodated automobile traffic and became a critical transportation corridor for the growing city.
Concerns about the bridge’s structural integrity led officials to close it to vehicle traffic in 1978. By 1980, city leaders were discussing demolishing the structure entirely by cutting it into sections and dropping it into the river. Instead, preservation advocates rallied to save the bridge.
It was added to the National Register of Historic Places in 1990 before reopening in 1993 as a pedestrian bridge after major renovations that replaced asphalt with wood planks and restored the steel framework.
Today, at 2,376 feet long, the Walnut Street Bridge remains one of the world’s longest pedestrian bridges and a defining symbol of Chattanooga’s riverfront revival and historic preservation efforts.
Source: City of Chattanooga