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North Hero – Grand Isle Drawbridge | Glossary
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Abutment: Part of a structure which supports the end of a span or accepts the thrust of an arch; often
supports and retains the approach embankment.


Bascule Bridge: A moveable bridge with a counterweight that continuously balances a span, or “leaf,”
throughout its upward swing to provide clearance for boat traffic. It may be single or double leafed.


Bridge Rail: The part of the bridge structure that forms a longitudinal deck edge barrier.


Construction Manager / General Contractor (CMGC) Process: This project delivery method allows an owner, in this case VTrans, to engage a construction manager during the design process to provide constructability input. The Construction Manager is generally selected on the basis of qualifications, past experience or a best-value basis. During the design phase, the construction manager provides input regarding scheduling, pricing, phasing and other input that helps the owner design a more constructible project. At approximately an average of 60% to 90% design completion, the owner and the construction manager negotiate a ‘guaranteed maximum price’ for the construction of the project based on the defined scope and schedule. If this price is acceptable to both parties, they execute a contract for construction services, and the construction manager becomes the general contractor.


Deck: The portion of the bridge that directly carries traffic.


Fascia: The fascia forms the outer edge of the bridge.


Substructure: The portion of the bridge that supports the superstructure and distributes all bridge loads to below-ground bridge footings.


Superstructure: The portion of the bridge that supports the deck and connects one substructure element to another