CME completed the structural design for the replacement of the concrete deck for approximately 1 mile of contiguous bridge structures that carry I-91 over a network of at-grade roadways in Springfield, Massachusetts. The elevated highway corridor, featuring 67 separate spans in the northbound lane and 62 spans in the southbound lane comprise the area known as the Springfield Viaduct. The project limits include I-91 northbound and southbound, just south of State Street and end in the vicinity of the I-291 Interchange ramps. Rehabilitation of the various on and off ramps between these limits and the I-291 ramp structures is included in this project.
This high-profile $175 million project involves the replacement of the deck and widening of the left and right shoulders to accommodate new lighting and improved drainage structures. These features incorporate Best Management Practices (BMPs) to mitigate impervious highway cover and meet Waste Load Allocations in accordance with MassDOT’s Impaired Water Program. The BMPs help to improve water quality in the Connecticut River through better treatment of storm water runoff from the highway which runs parallel to the river.
The project was constructed in 3 primary stages to accommodate traffic through the work zone. The initial stage included the preparation of the city streets and minor widening to the structure. The second and third stages include the closure of all on and off ramps to the structure while maintaining two lanes of traffic in either direction through the viaduct.
CME was selected to prepare the entire structural design for this project. The bridge design work involves the replacement of all bearings and drainage structures, steel repairs, replacement of approx. 450 high load multi-rotational (HLMR) bearings, retrofit (elimination) of 161 pin and hanger assemblies, and repairs to the substructure. To expedite the project, CME proposed Accelerated Bridge Construction methods by using precast deck panels to reduce the construction schedule from 6 years to 3 years. Following bid selection, the Contractor elected to use a standard cast-in-place deck but employed other methods to meet the accelerated project schedule.
CME continued to work closely with MassDOT during construction to provide a review of all contractor submissions and design structural steel repairs as work continued through the viaduct.
Full Beneficial Use of the I-91 Viaduct and associated ramps was reached on December 22, 2017.