Milton Madison Bridge
- Apr 22, 2014
In April 2014, a new half-mile Milton Madison bridge became the longest bridge to be slid laterally into place. This replaced the original bridge that was built in 1929 that carried US 421 across the Ohio River. Due to age and deterioration, the original bridge was found to be functionally obsolete and structurally deficient, restricting truck traffic from crossing. The bridge is critical for the 11,000 vehicles that travel the bridge each day, the only crossing on a 72-mile stretch of the Ohio River.
Construction for the new bridge began in the fall of 2010, with the old bridge remaining open during work on the piers. The new bridge used innovative bidding, design and construction methods. Superstructure replacement involved building a new steel truss atop the existing piers, which will be brought up to modern standards, and the deck, which included epoxy-coated reinforcing steel.
The design-build contract called for the bridge to be closed for a maximum of 10 days. Walsh chose to move the 2,427-foot-long truss along steel rails and plates and “slide” it 55 ft into place atop the existing piers. This method of construction made it the fastest modern-day bridge built across the Ohio River.
The bridge includes a wider steel-truss superstructure, scour mitigation for the existing piers and an ADA compliant pedestrian walkway.