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Brunswick Maine Street Bridge Feasibility Study Preliminary Alternative Evaluation September 12, 2019.

Published byNeal Carr Modified over 5 years ago

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Presentation on theme: "Brunswick Maine Street Bridge Feasibility Study Preliminary Alternative Evaluation September 12, 2019."— Presentation transcript:

1 Brunswick Maine Street Bridge Feasibility Study Preliminary Alternative Evaluation
September 12, 2019

2 Introductions Town of Brunswick John Eldridge – Town Manager
Ryan Leighton – Assistant Town Manager Ryan Barnes, PE – Town Engineer MaineDOT Nate Howard – Bureau of Planning T.Y. Lin International Tom Errico, PE

3 Study Objective Deck Replacement Currently Programmed
Preliminary evaluation of transportation improvement alternatives on or adjacent to the Maine Street bridge over Route 1 in downtown Brunswick Each alternative was evaluated based on: Mobility Access to surrounding businesses Regional accessibility Safety Compatibility with the future Riverwalk extension from the Swinging Bridge to the Frank J. Wood Bridge Cost (without right-of-way)

4 Alternatives Investigated/Evaluated
A1: No-Build A2a: Partial Single Point Urban Interchange (SPUI) A2b: Full Single Point Urban Interchange (SPUI) A3: Roundabout at the Maine Street/Cabot Street intersection A4: Diamond Interchange (Adding a Route 1 Northbound Ramp opposite Mill Street) A5: Combining the Route 1 Southbound On-Ramp with Cabot A6: Combining the Route 1 Southbound On-Ramp with Cabot and Adding a Signal at Mason Street

5 A1: No-Build Deck Replacement (A1, A3, A5, A6). For these alternatives, it is anticipated that changes to the proposed traffic pattern would fit within the limits for the existing structure. The existing beams and substructure units are repaired as needed and reused, while the existing concrete deck is removed and replaced in the same footprint as the existing structure. It is assumed that for a deck replacement the structure would need to remain in service and that all work would need to be completed using phased construction.

6 A2a: Partial Single Point Urban Interchange (SPUI)

7 A3: Roundabout at the Maine Street/Cabot Street intersection

8 A6: Combining the Rt. 1 SB On-Ramp with Cabot Street

9

10 Schedule / Next Steps / Funding
Town Decision – Fall 2019 Design – 2020/2021 Construction – 2022+ MaineDOT to contribute up to $5.9M

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