Cambridge Turnpike Improvement Project (CTIP)
Concord’s Cambridge Turnpike extends 6,800 feet as an essential gateway to this richly historic community. The roadway includes residential neighborhoods and is an important commuter corridor. The roadway has two significant marsh crossings of Mill Brook. These crossings are underlain by deep peat layers, which for decades caused significant settlement and chronic, severe, and dangerous roadway flooding. The $12MM project incorporated unique applications of deep ground geotechnical improvements to support raising the roadway including bridges and culverts, thereby mitigating flooding while minimizing impacts to important and extensive wetlands. This was combined with context sensitive design of a multi-modal corridor in the significant historic setting.
CMA Engineers. Inc. was the lead engineer working with Concord Public Works and a comprehensive project team that included Ward Geotechnical (geotechnical investigations), GCG Associates (survey), ESS Group (wetlands permitting), Ironwood Design Group (landscape design), and Public Archaeological Laboratory (archaeological review). The two contractors constructing the project were J. Tropeano, Inc (roadway and utilities), and George R. Cairns & Sons (geotechnical improvements, retaining walls, bridges, and culverts).