Checkered House Bridge over the Winooski River
Boswell, as a member of the design/build team led by Harrison & Burrowes Bridge Constructors, Inc. and CHA, Inc., provided Independent Quality Assurance/Quality Control and Construction Supervision services for the reconstruction and widening of the 350-foot truss bridge over the Winooski River. The 85-year-old steel span was too narrow and in need of a significant structural upgrade to provide a much safer bridge crossing for the traveling public. In order to preserve the historic Checkered House Bridge and upgrade it to meet modern standards, it was necessary to keep the original superstructure intact and widen the entire width of the bridge by 12.5-feet. The widening was accomplished by cutting and moving the entire North truss chord in place by 12.5-feet. In addition, all work was required to comply with the current National Historic Preservation Act and the U.S. Department of Transportation standards. This extremely complex project presented many challenges during its construction including ice flows, wind loading, maintaining aesthetics, extensive flood conditions and sensitive environmental issues. Since the bridge remained closed during construction, the project further consisted of the construction of the longest U.S. temporary bridge (267-foot-long Mabey bridge) over the Winooski River in order to accommodate the redirected traffic. This unique $14 Million Truss widening project was the recipient of numerous awards: the National Council of Structural Engineers Association (NCSEA) - Excellence in Structural Engineering Award; the International Bridge Conference (IBC) - G. Lichtenstein Medal; the Vermont ACEC Engineering Excellence Award – Grand Award; the FICE Engineering Excellence Award – Structures Grand Award; and the ACEC National Honor Award; and ENR Best Bridges Award.