Wednesday, March 21, 2018


Scope of Work
Cianbro constructed and erected a 930 ft long by 90 ft wide lift span bridge over the Quinnipiac River inlet at New Haven Harbor—the largest lift span bridge on the East Coast and second heaviest in the USA.

Project Details
Cianbro managed the substructure completion:
  • Installed 5,190 lf of 30 inch diameter caissons anchored 15 ft into bedrock and 40 ft below sea level with 2,400 lf of 24 inch diameter rock sockets 
  • Drove 22,100 lf of timber pile
  • Constructed concrete piers and abutments
Cianbro managed and self-performed:
  • Constructed two 1,250 ton, 150 ft high bridge support towers 
  • Constructed a 3,000 ton, 270 ft long by 92 ft wide by 40 ft high lift span—with four vehicular lanes, a pedestrian sidewalk, and a railway line—on a barge which was floated into position for erection
  • Erected approximately 8,000 tons of steel
  • Installed and torqued over 200,000 bolts
  • Installed 575 tons of steel rebar
  • Placed over 10,000 cy of concrete
  • Installed four 100 HP motors to power the mechanical lift section
  • Installed eight 20 ft diameter, 90 ton sheaves with a 60:1 gear ratio
  • Fabricated 150 tons of stairs and platforms
  • Installed stainless steel cladding on the bridge towers
  • Disposed of more than 30,000 tons of contaminated soil
Enthusiastic partnering between Cianbro, the Connecticut DOT, Hardesty & Hanover, Parsons Brinckerhoff, and the entire Tomlinson team created innovative ideas to successfully meet the demands of this challenging project.

Unique Challenge

Cianbro erected the 3,000 ton lift span on a 220 ft by 140 ft assembly barge—built from 76 individual pontoon barge sections and completed the float-in phase of the lift span erection during a five-day channel shutdown.

Project Information

Connecticut Department of Transportation

Type of Project:

Construction Schedule:
Completed December 2002

New Haven, CT
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