Langley Parkway Bypass

Concord, New Hampshire

Client: City of Concord, New Hampshire


  • Bid Service
  • Construction Administration
  • Drainage
  • ROW Management
  • Sewer Design
  • Stormwater Study
  • Utility Management

Project Summary

Hoyle, Tanner provided transportation planning, engineering, landscape architecture, and construction administration and inspection services for design of a 1.3km (4,350 lf) connector road from Pleasant to Clinton Street in Concord, New Hampshire. Pleasant Street and Clinton Street are vital in distributing and regulating traffic flow in the westerly portion of the City. Concerns for the increasing traffic volumes on these roadways, as well as intersecting roadways, resulted in the City’s undertaking of the construction of this southerly leg of an urban bypass. This project included traffic planning analyses, providing a traffic forecast that was used for the design of the roadway and intersection geometries as well as determine the impacts/benefits the parkway would have on the area’s roadway network. The parkway design incorporated environmental mitigation measures for wetland replacement and provisions for pedestrian and bicycle traffic as well as connections to hiking and cross-country ski trails.

The Clinton Street Stormwater Management Study was completed as part of this project. This study compiled data from existing conditions, planned development, and construction activities, to provide direction as to the best course of action for stormwater management in the vicinity of the proposed intersection of Clinton Street and the Langley Parkway (south). A final study document was prepared to include all information collected, which serves to justify the rational for selection of the recommended alternative and document reasons for the exclusion of others. A precast concrete 3-sided rigid frame pedestrian underpass was designed to connect recreational trails to each side of the proposed roadway. Roadside design features reflected the vegetative character and multiple land use of the area; from commercial to residential land use through woodlands and agricultural fields.

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