New Sarah Mildred Long Bridge

OPENED MARCH 30, 2018 CONNECTING KITTERY, MAINE AND PORTSMOUTH, NEW HAMPSHIRE.

The New Sarah Mildred Long Bridge Replacement Project is the result of a partnership between Maine and New Hampshire’s Departments of Transportation; the two states equally shared the costs of replacing the bridge. Maine DOT led the project on behalf of both states, with support from the Federal Highway Administration. The bridge features over 2,803 feet of precast segmental bridge for vehicles above a 1,795-foot precast segmental heavy rail bridge. Design was by FIGG/Hardesty & Hanover, Joint Venture, with FIGG accomplishing the segmental bridge spans. The project team worked together to understand the community’s vision of the bridge aesthetic preferences which was achieved through creating a precast concrete segmental bridge design and a lift span over the main channel. The design centered around the community’s theme: “Local simplicity of the Working Waterway”.

The new bridge creates an aesthetically pleasing solution using segmental technology.

Long open span lengths of 320ft. for the vehicle bridge were built in balanced cantilever construction. The heavy rail spans of (Cooper E80 loading) of 160ft. tie with the columns of the vehicle bridge and have interim foundations. These spans were built using the balanced cantilever method also the towers/piers of the life span are made of precast concrete segments with hollow sections shaped to accommodate the lifting mechanisms. The new bridge creates an aesthetically pleasing solution using segmental technology.

Project Details

Owner:

Maine DOT (Lead Agency) and New Hampshire DOT
 

Designer (Superstructure):

FIGG for Segmental
 

Substructure:

FIGG/Hardesty & Hanover JV)
 

Designer (Superstructure):

FIGG for Segmental Substructure (FIGG/Hardesty & Hanover JV)
 

Contractor:

Cianbro Corp.
 

Contractor Engineering Services:

McNary Bergeron
 

Construction Engineering Inspection:

FIGG, Lamb-Star Engineering, L.P.
 

Formwork for Precast Segments:

Ninive
 

Erection Equipment:

Cianbro Corp.
 

Post-Tensioning Materials:

Structural Technologies VSL
 

Bearings:

R.J. Watson
 

Expansion Joints:

Watson Bowman Acme Corp.
 

Epoxy Supplier:

Euclid Chemical Company
 

Prepackaged Grout:

Euclid Chemical Company
 

Precast Producer:

Unistress
 

Footing Tub Segment Precasting Facility:

Coastal Precast