Project Detail

Niantic River Bascule Bridge Replacement

East Lyme & Waterford, CT

The Construction Manager was URS Corporation.

Scope of Work

The Cianbro/Middlesex Joint Venture Team constructed a new two-track, electrified railroad bascule bridge across the Niantic River, 58 feet south of its present location. 

Project Details

  • Demolished/removed the existing bridge and associated piers and abutments
  • Installed a new reinforced HDPE fender system with eight, 78-inch diameter by 40-foot FRP monopiles and 57 ea. 14-inch diameter by 40-foot FRP piles
  • Expanded navigational channel beneath the bridge from 45 to 100 feet and increased the vertical under-clearance above the water from 11.5 to 16 feet
  • Constructed in-water cofferdams for 21.5-foot thick tremie footings
  • Erected over 1,400 tons of structural steel, including two, 13-foot tall, 106-ton approach girders and two, 141-ton bascule heel girders
  • Floated-in the new single leaf bascule span and jacked for placement
  • Installed 7,600 feet of overhead 25 kV catenary traction power system
  • Installed new electrical control and operating systems and over 90,000 pounds of new operating machinery and supports
  • Installed scour protection stone alongside the new precast concrete sheet wall in layers comprised of individual stones from 10 pounds to 12,000 pounds
  • Demolished the existing boardwalk and installed precast concrete T-wall and concrete sheet pile retaining walls, and concrete sidewalk
  • Replenished the beach with 76,000 cubic yards of sand

Lean, Innovative, and Unique Project Solutions

This project required in-depth, extensive safety and environmental planning as the entire project was constructed in an environmentally sensitive area surrounded by three freshwater wetlands and two shell fishing areas. 


ABC National Excellence in Construction Award
ABC Connecticut Best in Show Excellence in Construction Award