Head to Portsmouth tomorrow for this fun event!


The SML replacement project is a joint venture between the Maine and New Hampshire Departments of Transportation, with MaineDOT serving as the lead. This project is part of a “Three Bridge Agreement” between Maine and New Hampshire to address their jointly owned bridges spanning the Piscataqua River. The other two bridges are the “high level” bridge that carries I-95, and the Memorial Bridge that links the communities of Portsmouth and Kittery, and offers vehicle, bike and pedestrian travel.

  • The design process began in 2013 and construction started in January, 2015.
  • The existing bridge is scheduled to be closed from November 1st, 2016 to late September/early October, 2017.
  • The new Sarah Mildred Long Bridge opens to traffic late September/early October, 2017.
  • The project is scheduled to be completed by June 1st, 2018.

For news and construction updates, please visit the What's New page.