DTC

Easthampton, Route 10 (Northampton Street) over the Manhan River, Bridge No. E-05-006

One of DTC’s assignments under its ABP Statewide Design Services Contract is Route 10 (Northampton Street) over the Manhan River in Easthampton. The project consists of replacing the existing bridge. The bridge will be closed during construction, requiring a detour. The existing bridge, with a single span of 96 feet, is a built-up riveted steel plate deck girder with floor beams, stringers, and a concrete deck.

The design process consists of developing a Type Study Report in which bridge alternatives suitable for the site will be developed for comparative evaluations. The evaluations will be based on accelerated construction techniques, minimizing impacts to the environment, abutters, traffic, and ultimately keeping construction costs to a minimum. Anticipated alternative structure types include a multiple steel plate deck girder, concrete arch, and pre-stressed concrete girders. Anticipated substructure alternative types include cantilevered abutments founded on ledge, stub abutments on concrete drilled shafts, and precast abutments.

The proposed bridge will be widened from the existing 41 feet to 54 feet to accommodate an additional turning lane. The proposed bridge is anticipated to be longer as a result of constructing new abutments behind the existing abutments. The existing abutments will be cut down and will provide scour protection for the new abutments. Permanent retaining walls will be constructed at each abutment corner in order to provide additional embankment protection for the Manhan River.

Roadway work will consist of full depth pavement reconstruction of Northampton Street, West Street, and Mill Streets adjacent to the bridge. Traffic signal designs will be performed at the Northampton and West Street intersection and at the detour intersection of Northampton and O’Neill Streets.

Additional services will include providing supplemental survey, developing a functional design report, presenting the project at a Public Hearing, environmental permitting, developing PS&E Contract Documents for advertising, and construction administration. PS&E documents are scheduled for completion in 2011.

Sterling, Route 62 (Princeton Road) over the Stillwater River, Bridge No. S-25-006

One of DTC’s assignments under this Contract was Route 62 (Princeton Road) over the Stillwater River. This project consisted of a Design Review Service of the 90% Bridge Design Documents. The documents included plans, special provisions, and estimates. The proposed bridge is a single span structure of steel beams made composite with precast concrete deck panels supported by precast integral abutments founded on steel H-Piles. The bridge span is 45 feet.