This bridge with 3 spans (111-ft. center span) is a steel through truss in the city center.

Part of a large project to rebuild Chicago's Wacker Drive involved rebuilding an 1899 steel bridge for the Chicago Transit Authority's elevated trains. The original specification required rebuilding the bridge in section on weekends in one month; however, the bridge owner approved the contractor's value-engineering proposal to pre-build the bridge and then moved it into position over a single weekend. The center span was constructed near the site and moved on a special hydraulic carrier about 75 ft. west and 5 ft. north, where it was placed on new foundations and connected to two shorter spans on either side. In spite of stiff contractual penalties for any delay ($1,000/minute), work was completed over a weekend in May 2002 with 2 hours to spare.

The 425-ton, 111 ft. long and 25 ft. high center-span superstructure was prefabricated.

Chicago Transit Authority (CTA) avoided significant disruption to travelers commuting into the city from the north. CTA would have had to provide additional, costly shuttle services. Prefabrication allowed Walsh Construction to operate in a more controlled environment and to avoid the major shoring effort that would have accompanied rebuilding the existing structure while keeping it open for weekday traffic, thus limiting company liability for financial penalties. The use of prefabrication reduced disruption to vehicle drivers from 6 months to a single weekend; it reduced disruption to transit users from four to six weekends to a single weekend.