ROCKINGHAM BRIDGE BR#24S
IM 091-1(66) Rockingham
REPLACEMENT OF BRIDGE NOS. 24 N&S ON I-91 IN ROCKINGHAM, OVER THE GREEN MOUNTAIN RAILROAD AND THE WILLIAMS RIVER.
Project Location: Town of Rockingham in Windham County on Interstate 91 over the Williams River and Green Mountain Railroad. The bridges are located approximately 1/4 mile north of Exit 6 on Interstate 91.
The Rockingham Bridge 24N and 24S project will replace the existing bridges, which are in poor condition, with two new bridges on the same alignment. The existing bridges are twin four span, two lane structures which were constructed in 1960-61 and rehabilitated in 1988. The bridges are 850-feet in length. The existing bridge superstructure (deck and beams) is composed of a steel deck truss, as well as a concrete slab, and are in poor condition with areas of significant concrete spalling and exposed rebar on the underside of the deck as well as areas of section loss in structural steel. Additionally, the existing bridges are narrow, only 30 FT wide, compared to the required 38 FT width of the standard Interstate.This project is being contracted as a Design-Build project meaning a method of project delivery whereby a single entity is contractually responsible to perform design, construction, and related services. Design-Build teams will each submit Technical and Price Proposals which will then be scored by VTrans based on the quality of the bridge concept. The team with the best combination of concept and bid price will be awarded the contract.
The new bridges will be 4-span structures spanning approximately 852 feet each. The superstructure will be comprised of 5 precast concrete bulb-tee girder lines. The new bridges will be wider than the existing bridge with two 12-ft travel lanes, a 4-ft left side shoulder, and a 10-ft breakdown lane. Both Bridge 24N and 24S will have abutments and pier substructures supported by footings on piles, with the exception of one pier on each bridge bearing on bedrock.
During construction, the bridges will be constructed in two phases with one bridge being built at a time. Highway crossovers will be utilized so that one lane of traffic in each direction will be maintained on one of the existing bridge structures while the other new bridge is constructed adjacently. Once the new bridge is finished the crossover will reverse and traffic will be maintained on the new bridge structure while the second bridge is built. It is anticipated that the bridge and approach work will be constructed over the course of multiple years. The target construction schedule is set for mobilization by the beginning of the 2017 construction season with the project completion by the end of the 2020 construction season.
Accommodations for Traffic During Construction: The bridges will be constructed in two phases with traffic being maintained on crossovers and one lane of traffic in each direction.
Link to project sharepoint site: https://outside.vermont.gov/agency/vtrans/external/Projects/Structures/12a130
Contact Information
**Please note: Contractors are to direct all inquiries to Contract Administration during project advertisement.
VTrans Project Manager
Carolyn Cota
(802) 917-4891
carolyn.cota@vermont.gov
VTrans Resident Engineer
Judy Gilmore
(802) 786-0022
judy.gilmore@vermont.gov
