.

Project Specs:
Bridge Type: Arch
Steel Tonnage: 1,239 tons
Steel Type: Grade 50
Coating: Painted

The Project Team:
Project Owner: New Hampshire DOT
Contractor: Cianbro Corporation
Designer: NHDOT Bureau of Bridge Design
Detailer: Upstate Detailing, Inc.
Steel Fabricator: High Steel Structures, Inc.
Steel Erector: Cianbro Corporation

Box girders assembled at HSSI Yard

Project Description:
High Steel Structures, Inc. was pleased to take part in the construction of the NHDOT Rte 9 Chesterfield Arch over the Connecticut River  The 426.5-foot long, 50.8-foot wide structure stands alongside an existing arch bridge built in 1936.  The narrower original span, which is practically identical in design to the new bridge, was retrofitted as a pedestrian bridge. 

High Steel fabricated eighteen FCM box girders for the job.  Their excessive weight, up to 70,000 pounds each, required that they be shipped in custom-made lowboy trailers. Erection of this project was a challenge, work was done off of

barges on both sides of the river. General Contractor Cianbro Corporation

of Pittsfield Maine held the components back on each side with the aid of 110 foot tall tieback towers, and the keystone piece was set into the center to complete the structure.

 

The new arch begins to take shape

This project was completed in October, 2003.

Back to Project Menu