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February 17. 2013 6:38PM

Engineers Week: Newington-Dover Pedestrian Bridge now serving Hilton Park users

The Little Bay Bridges carry U.S. Route 4, N.H. Route 16, and the Spaulding Turnpike across the mouth of Little Bay, where it meets the Piscataqua River, between the City of Dover and the Town of Newington.

As part of the improvements being performed to the Spaulding Turnpike between Newington and Dover, the existing General Sullivan Bridge adjacent to the Little Bay Bridges is being rehabilitated to act as a pedestrian/bicycle bridge between Newington and Dover. The proposed realignment of Hilton Drive (at the Dover approach to the General Sullivan Bridge) required demolition of the existing ramp to the bridge, and construction of a pedestrian access structure.

The new pedestrian bridge and approach are contained within Hilton Park, and therefore had to feature certain aesthetic properties such as a shallow nature and pleasing lines. The selected bridge alternative was chosen based on public input from the project stakeholders.

GM2 Associates Inc. of Concord was tasked with the design of the bridge and bridge approach walls. The pedestrian access structure consists of a Mechanically Stabilized Earth (MSE) wall embankment that is approximately 155 feet long and a bridge that is 140 feet long. The bridge is a unique structure that incorporates many components that make the bridge very complex in nature.

The bridge is a three-span continuous structure with a cantilever end span.

The bridge has a reverse curve alignment with varying deck widths and extremely sharp curvature.

The width of the bridge varies from 14 feet to 21 feet where the bridge ties in with the General Sullivan Bridge.

GM2 Associates performed the complete structural design, shop drawing review and provided other design services during construction. Vanasse Hangen Brustlin, Inc. of Bedford was the prime consultant on the Spaulding Turnpike improvements. The N.H. Department of Transportation was the client. The pedestrian access structure was constructed over the winter of 2010-2011 by Cianbro Corp. and was opened to pedestrian traffic in May, 2011.



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