Boswell Engineering, as a member of the Harrison & Burrowes Bridge Constructors Design/Build team, provided Independent QA/QC and Construction Supervision services for the econstruction and widening of the 350-foot long, 20-foot wide Pennsylvania through truss bridge carrying U.S. Route 2 over the Winooski River.

The 85-year-old steel span was too narrow and in need of a significant structural upgrade to provide a safe river crossing for the traveling public. In order to preserve this historic steel structure and meet modern standards, it was necessary to keep the original superstructure intact and widen the width of the bridge by 12.5-feet. The widening was accomplished by separating the entire north truss chord in place and, by the use of a jackside – launching system, moving it 12.5 feet and re-connecting the two sections. Since the bridge was closed during construction, the project further involved the building of the longest single-span temporary Mabey bridge (267-foot-long). All work was in accordance with the National Historic Preservation Act and the U.S. Department of Transportation standards.

This $17 Million Design/Build project was the recipient of several prestigious awards: The National Council of Structural Engineers Association (NCSEA) - Excellence in Structural Engineering Award; the International Bridge Conference (IBC) – G. Lichtenstein Medal; the Vermont American Council of Engineering Companies; Engineering Excellence Award – Grand Award; the American Council of Engineering Companies – National Honor Award; and Engineering News – Record’s – Best Bridges Award.