Sebago Technics is a key member of the Figg/Hardesty Hanover CMGC Team performing the roadway and intersection design, traffic engineering, and railroad design in support of this $160M two-state construction project between Maine and New Hampshire.
The scope of this Project entails the replacement of the existing vertical lift (middle) bridge over the Piscataqua River between Kittery, ME and Portsmouth, NH. The new design calls for a two-level structure to carry automobiles and rail over the river just upstream of the existing bridge. The vertical alignment of the new bridge will provide added clearance for ship traffic so as to reduce the number of openings by as much as 65%. The Portsmouth approach will remain largely the same as it is today with the Project limit being located at the intersection of the Market Street Connector. The Kittery approach, though, calls for a new signalized intersection to replace the existing grade separated interchange with Bridge Street.
Sebago is responsible for the overall bridge alignment development, as well as the two approach designs – road and rail. In addition, the firm prepared the necessary ROW mapping and conducted much of the utility coordination with assistance from MaineDOT. The firm provided design support during construction. The Project was completed in Spring of 2018.
Project DetailsSarah Mildred Long Bridge
- Client: Figg, Hardesty-Hanover
- Location: Kittery, ME and Portsmouth, NH Date Completed: Spring 2018
- Services: Transportation
- Tags: Construction Phase Services, Horizontal and Vertical Alignment Development, Railroad Design, and Service Utilities