Project : Spaulding Turnpike Reconstruction and Widening

New Hampshire Department of Transportation (NHDOT) -- Rochester, New Hampshire

CHA completed the design for the reconstruction and widening of 5.2 miles of the Spaulding Turnpike between Exits 11 and 16 in the City of Rochester, NH. The project included 17 structures, 5 interchanges, 7 signalized intersections, 4 miles of ramps, and 3 miles of secondary roads, and was divided into six construction contracts. Structural design work included eight new bridges, six bridge rehabilitations, and three retaining walls. The project also included drainage design, traffic control plans, wetlands mitigation and hydraulic analysis.

The bridges included single span plate girders up to 160 feet, multiple span plate girders up to 270 feet, and concrete frames up to 50 feet. Some design features to accommodate unique conditions included curved girders on a tight 460-foot radius, ground improvement using stone columns, and foundations using pressure injected footings.

Services Provided by CHA:
  • Highway Design
  • Bridge Design
  • Structural Design
  • Drainage Design
  • Traffic Control Plans
  • Wetlands Mitigation
  • Hydraulic Analysis