Tuesday, January 23, 2018


Scope of Work
Cianbro replaced the grating bridge deck, center bearing, and motor drives on the 458 ft, two-lane swing span bridge.

Project Details
  • Jacked up the 900 ton swing span and replaced the spherical center bearing
  • Repaired balance wheels in the swing span
  • Installed new variable speed motor control consoles on the existing 60 HP motors for the bridge drive system 
  • Installed new limit switches and relay logic circuits to allow for automatic span operation
  • Demolished and removed the existing bridge deck and stringers while maintaining one-way traffic during night time lane closures—full two-way traffic was maintained during the day
  • Replaced 40 tons of structural steel stringers
  • Installed 11,000 sf of 5 ¼ inch new galvanized open grating bridge deck and stringers in panels weighing 10 tons each
  • Performed underwater repair of concrete piers
  • Installed 1,000 lf of Rob-Roy conduit
  • Installed a closed circuit, fiber-optic security camera system
  • Paved 600 ft overlay of bridge approach

Unique Challenge

The Cianbro team successfully completed several heavy rigging challenges that included jacking up the 900 ton swing span, installing a 5 ton casting for the center bearing, replacing the spherical center bearing and installing 12 ft by 22 ft,10 ton deck grating panels.

Project Information

Connecticut Department of Transportation

Type of Project:

Construction Schedule:
Completed July 1999

East Haddam, CT

Project Awards

Cianbro won the 2001 Build Connecticut Award for this challenging project.
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