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I-91 Brattleboro Bridge Project: Engineering Innovation

Brattleboro, VT, USA

Client Figg Bridge Engineers
Industries Transportation, UD&I
Services Geotechnical Engineering - Soil and Rock Mechanics

Golder Associates serves as Geotechnical Lead on the award-winning I-91 Brattleboro Bridge project that called for the design and construction of two bridges to replace the four existing sections in Brattleboro, VT. The redesign brings the north and southbound lanes of I-91 of Bridge 8 and Bridge 9 onto a single bridge, and moves the centerline of the Interstate slightly east. When complete, the bridge will carry four lanes of traffic, and have the capacity of up to eight lanes. 

Our Role

As lead, Golder is responsible for all geotechnical engineering aspects of design, including criteria for all bridge foundations, retaining walls, embankment widening, reuse of onsite materials, and resolving any potential design impacts that may occur during the construction phase. Rock socketed drill shafts for the bridge piers, pile foundations, and spread footing shallow foundations supported on rock are also part of Golder's scope, and are designed to meet proposed AASHTO guidance. Other duties include computer modeling to evaluate bearing resistance for MSE walls, global stability analysis, subsurface investigations, such as test borings and geologic mapping, and geotechnical lab testing to define subsurface conditions and material parameters. 

Innovative Design

  • Brattleboro's quad-wall pier system has an opening between two walls with four legs to the column, is designed to look like a giant tree, and includes eco-stained piers and stone relief columns.
  • Bridge footings requred a 700-yard, mass-concrete pour—the largest in Vermont's history.
  • The belly of the concrete bridge deck will have an arched shape, and be painted to emulate the sky, which is aesthetically pleasing nto kayakers rowing under the deck. 
Throughout the bridge project, Golder works with other project leads, including Figg Bridge Engineers (lead designer), Vermont Agency of Transportation (project owner), PCL Civil Constructors (contractor), and FHWA. In December 2014, this project earned the top spot on the Roads & Bridges Top 10 Bridges list. The bridge is scheduled to complete in April 2016.  



Associated Services

Engineering Services
Founded in 1960, Golder quickly became an industry leader in ground engineering, soil and rock mechanics, and environmental services for the...

Ground Engineering Services
From initial investigations through to design, construction, operation and closure, Golder provides integrated geotechnical services to...

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