The Massena Lateral Bridge Slide project consists of replacing the existing 40’ x 30’ steel I-beam bridge (FHWA #017840) that was constructed in 1930 and is currently classified as structurally deficient with a sufficiency rating of 38. The proposed bridge replacement is intended to increase the structural capacity of the bridge, improve roadway conditions, and enhance safety by providing a wider roadway. Construction zone safety will be greatly improved due to the introduction of innovative accelerated bridge construction (ABC) methods (limit traffic interference to a period of nine days or less). Furthermore, by minimizing the need for future maintenance that interferes with traffic flow, congestion and crashes will be reduced.
The replacement structure will be a single-span 120’ x 44’ bridge with precast abutment footings, wingwalls and superstructure fabricated adjacent to the existing bridge and moved into position by lateral slide. The contractor will be
- Fabricate/cast the precast substructure components at a casting yard off-site or near the bridge site prior to road closure.
Construct the bridge superstructure on temporary false work adjacent to the existing structure while the roadway remains in service. Laterally slide the new bridge into position once the roadway has been closed, existing bridge demolished
and precast substructure put into position.
- An offsite detour will be used during the nine day road closure to allow field erection and bridge completion.
This project presents a unique opportunity to effectively promote and advance ABC for rapid renewal of the bridge infrastructure. The project represents a significant effort by the Iowa DOT to deploy a promising ABC method, lateral bridge
slide, for the first time in Iowa.