ECI – Engineers Construction

ECI was contracted with the City of South Burlington to install a temporary bridge over the failed culvert conveying the Muddy Brook under Kimball Avenue (Marshall Avenue on the Williston side).  The Muddy Brook is at the town line between Williston and South Burlington.  The municipalities jointly own the 16-ft multiplate culvert embedded in the 30-ft-high road embankment.  The culvert failed on April 7th during a high water event.  ECI responded that day to stabilize the site and barricade off the road.

ECI was subsequently contracted on April 11th to install the temporary bridge to allow the road to reopen to the traveling public.  The road closure had a significant impact on local traffic which was worsened from the impact of other local roadway projects.

The replacement bridge consists of a 150-ft pre-engineered modular steel truss bridge manufactured by Mabey Universal Bridge.  The bridge is owned by VTrans.  ECI’s scope of work involved design and construction of the bridge substructure, assembly and installation of the modular truss superstructure, paving of the deck and approaches, and final restoration to allow for traffic.

The bridge substructure consisted of a shallow footing abutment with a concrete waste block backwalls.  The bridge was assembled at the east abutment and rolled towards the west as the modular sections were installed.

The bridge was re-opened to the public on April 26th and will remain in service while the municipalities design and construct a new culvert.