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Little Bay Bridge Construction

Location:
Newington & Dover, NH
Completed:
2013

Scope of Work

Cianbro constructed a nine span, 1,639 feet bridge carrying two northbound and southbound lanes of the Spaulding Turnpike over Little Bay. The new bridge was built between the existing General Sullivan and Little Bay Bridges.

Project Details

  • Constructed a temporary work trestle for construction access
  • Installed 24 each – 8 feet, 6 inch diameter drilled shafts
  • Constructed two reinforced concrete abutments supported on steel pipe piles
  • Constructed 8 each reinforced concrete piers
  • Constructed a reinforced 75 feet wide concrete deck on seven lines of structural steel girders
  • Constructed a 12 feet wide pedestrian approach bridge to the existing General Sullivan Bridge on the Dover side
  • Performed all associated approach roadwork including 400 linear feet of roadway on the Newington approach and 2,300 linear feet of roadway on the Dover approach
  • Realigned and reconstructed approximately 2,600 linear feet of Hilton Drive
  • Constructed 700 linear feet of mechanically stabilized earth retaining wall and 700 linear feet of wood panel sound wall on a crash barrier and concrete slab along the west side of the Spaulding Turnpike north of the new bridge
  • Reconstructed approximately 2,000 linear feet of the pedestrian trail along Pomeroy Cover to accommodate emergency access

Lean, Innovative, and Unique Project Solutions

The construction schedule for this project was very linear and major phases of work could not be completed concurrently. Safety and activity planning were key project components, because the entire project was constructed over the Little Bay, which had very strong/fast moving currents. Additionally, the new bridge was constructed between the two existing bridges. The new bridge was 75 feet wide and the distance between the existing two was 100 feet.

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