Missisquoi Bay Bridge

Swanton & Alburg, VT

Cianbro mobilized this project rapidly by bringing in 190 truck loads of barge sections and crane equipment for five barge mounted cranes from May 11th – June 6th

Scope of Work

Cianbro constructed a new 3,400-footlong bridge with a concrete deck placed over steel plate girders. Each span is 156 feet long and the roadway approaches include two, 330 foot long causeway approaches.

Project Details

  • Used 10 foot, 4-inch diameter casings acting as mini-cofferdams weighing up to 106,000 pounds each for the construction of twenty-two concrete piers and two abutments
  • Rock socketed the piers into the bedrock for anchoring
  • Installed pre-tied rebar cages weighing up to 27 tons and placed tremie concrete
  • Constructed pier stems and hammer head pier caps using an EFCO form system
  • Constructed abutments utilizing a sheet-pile coffer system
  • Demolished the existing bascule span bridge built in 1938 and a 800 feet of the causeway

Lean, Innovative, and Unique Project Solutions

Cianbro constructed this project 100% from the water by utilizing barge mounted cranes. This project had strict environmental constraints from September to May due to a protected turtle environment. In addition to working from barges and the strict environmental constraints, Cianbro constructed the western approach to the bridge near an Indian burial ground for the St. Francis/Sokoki Band of Abenaki Indians and worked with archeologists and state representatives to complete the work around the burial site in a manner that allowed for recovery of sacred items.