Location:
Portland, Maine
Client:
Maine Department of Transportation
Project Information:
The “Million Dollar Bridge” carried Route 77 over the Fore River and linked the Cities of Portland and South Portland. That structure was completed in 1916. The new replacement structure, the Casco Bay Bridge, is located downstream from the existing structure. It is located on a curved alignment and is a divided roadway having four 12-foot traffic lanes. The replacement bridge is a mid-level structure with continuous multi-girder approaches with spans ranging from 60 to 240 feet. The main movable span consists of a 285-foot, four-leaf trunnion bascule bridge with an open grid steel deck. The total structure length is approximately 4,748 feet.
The Prime Consultant was T. Y. Lin International who was responsible for the concrete alternative approach superstructure and the substructures for both the concrete and steel alternatives.
Modjeski and Masters, Inc. provided the following engineering services:
- Preliminary and final design of the horizontally curved steel approach superstructures.
- Preliminary and final design of the substructures, superstructure, and pier protection system of the movable span. Final design included all structural, mechanical, and electrical design and the preparation of plans and specifications.
- Shop drawing review.
- Demolition of the existing bridge.
- Field engineering services during construction of the movable bascule span.