Sebago Technics was a key member of the PCL/Figg Design/Build Team that performed the roadway design, traffic engineering, transportation management planning including temporary traffic control design, and environmental permitting support for this $60M construction project.
The scope of this Project entailed the replacement of four existing bridges on the two-barrel interstate (two in each direction) over Upper Dummerston Road and the West River in Brattleboro. The new design provided single structures at each location with appropriate approach roadway tie-ins. The total Project length was approximately 1 mile, including the temporary crossovers at each end of the construction. Construction will occurred in 3 phases, each with its own set of plans and temporary traffic control arrays.
The 1080-foot, 3-span, West River Bridge is a first for Vermont, in that it is a variable depth segmental concrete box structure with a center span exceeding 500 feet that was constructed using cast-in-place techniques. The aesthetics of this unique, “post card” design earned it the top bridge in America ranking for 2014 by Roads and Bridges Magazine.
Another rather unique aspect of this Project for Vermont was the use of a Smart Work Zone package for advanced traveler information. This system is similar to what has been used in NH on I-89 and I-93 with message boards and a public website alerting drivers to real time congestion levels through the Work Zone. The Project commenced in early 2013 and was opened to traffic in mid-2017.
Project DetailsI-91 Bridge Replacements
- Client: Figg Bridge Engineers
- Location: Brattleboro, VT
- Project is : Current