MassDOT Route 5 Highway Design
AI is the design engineer for highway improvements along Route 5 (Mt. Tom Road) in Northampton, MA. Mt. Tom Road is a designated bike route that provides a critical link to the Manhan Rail Trail, and provides access to many downtown and recreational destinations along the Northampton-Easthampton-Holyoke corridor. The project is AI’s fourth assignment in a continuing on-call design contract with MassDOT, and consists of approximately 8,000 lf of roadway widening and resurfacing to accommodate bicycle traffic along the corridor. Sidewalks and a closed drainage system are being added to the project, where the existing drainage sheet flows off of the road to roadside ditches. There are several project challenges, some of which include surveying services through a heavily traveled corridor, minimizing environmental and wetland impacts, proximity to an active rail, and location within the 100-year flood plain. In particular, close proximity to the railroad presents design challenges due to pronounced grade change between the rail bed and road. The northerly project limit begins at the flood protection levy for the Town of Northampton, and a net-zero volumetric increase is a design requirement along the project alignment, located entirely within the regulatory flood plain. A series of compensatory excavations are being designed along the corridor to offset the volumes added by the addition of sidewalks and curbing.
AI is also providing early environmental coordination and environmental permitting for the project. Environmental permitting for the project includes wetlands permitting, flood management certification, and construction general permitting for discharge of stormwater from construction activities.
- Duration: 2012 - Present
- Project Scope:
- Highway design
- Roadway widening/ resurfacing
- Traffic signal & interchange design improvements
- Drainage design
- Environmental coordination