A new bridge connecting Portsmouth, N.H., and Kittery, Maine, features what engineers believe is the first-ever use of precast-concrete segmental towers on a vertical-lift bridge.
The $158.5-million Sarah Mildred Long Bridge project, slated to open by year’s end, is a joint venture between the Maine and New Hampshire departments of transportation, with MaineDOT serving as the owner. It replaces a 77-year-old bi-level bridge that closed last August.