Consulting Civil and Environmental Engineers Since 1972

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Replacement of Green Hill Road Bridge over the Hammonasset River
Town of Killingworth, Connecticut

THE CHALLENGE: The existing Green Hill Road Bridge spanned the municipal boundary between Killingworth and Madison, Connecticut. The existing clear simple span was 60 feet with 20 feet clear road width. The bridge consisted of monolithically cast tee-beams and deck with reinforced concrete abutments and wingwalls. The Connecticut Department of Transportation had determined that the bridge was structurally deficient and therefore eligible for funding through the State and Federal Local Bridge Programs. This project was one of the first eight bridge projects in the State to be funded through the Federal Local Bridge Program. THE S0LUTION: The new bridge is a 70 foot clear simple span, 32 foot - 8 inch clear road width, AASHTO HS20 designed adjacent prestressed box beam superstructure, on cast-in-place, concrete gravity abutments and wingwalls. The foundation engineering design resulted in a gravity substructure founded on bedrock. Cast-in-place reinforced concrete parapets and anodized aluminum bridge rails are components of the new structure. A membrane waterproofing system covers the box beams and bituminous concrete wearing surface maximizes durability. Metal beam approach guide rails of weathering steel and granite transition curbing complete the finished engineering details.

Green Hill Road was closed during the construction of the new bridge, which was completed in 1995. Final construction cost was approximately $900,000. Complete bridge engineering design services were provided by Nathan L. Jacobson and Associates, Inc. Project management was directed by an associate of the firm, specializing in bridge design. Services included everything from initial meetings with officials and adjacent property owners, to permit procurement, shop drawing review and periodic site inspection.

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