WELCOME The Walk Bridge Project CTDOT Project No

Transcription

1 1 WELCOME The Walk Bridge Project CTDOT Project No

2 Walk Bridge Public Scoping/Public Information Meeting 1. Project description 2. Study process 3. Findings 4. Potential solutions 5. Next steps 6. Ways to be involved 7. Questions and comments 2

3 The Public Scoping/Public Information Meeting... enables you to help shape this project and its outcomes through input regarding: Public Scoping Purpose & Need Goals & Objectives Impacts and Mitigation Alternatives Engineering Analysis & Design Preferred Solution Environmental Assessment & Mitigation Agency & Stakeholder Coordination 3

4 4 The Walk Bridge Project Location

5 5 The Walk Bridge Project

6 Bridge Issues Prompted the Project Recent history of span opening and closing difficulties. Open bridge shuts down the Northeast rail corridor. Hurricane Sandy shows need for bridge to withstand significant weather events. Rail use requires bridge to withstand substantial storm, maritime accident or earthquake damage. Making only emergency and scheduled maintenance repairs will not stop failures and unexpected expense. 6

7 Purpose and Need The purpose of this project is to rehabilitate or replace the existing, deteriorated bridge resulting in a resilient bridge structure which will enhance the safety and reliability of commuter and intercity passenger rail service, offer operational flexibility and ease of maintenance, as well as provide for increased capacity and efficiencies of rail transportation along the New Haven Line/ Northeast Corridor. The needs of the Walk Bridge are to increase bridge reliability, incorporate bridge redundancy, and provide a sustainable bridge design for significant weather events. 7

8 Purpose and Need The purpose of this project is to rehabilitate or replace the existing, deteriorated bridge resulting in a resilient bridge structure which will enhance the safety and reliability of commuter and intercity passenger rail service, offer operational flexibility and ease of maintenance, as well as provide for increased capacity and efficiencies of rail transportation along the New Haven Line/ Northeast Corridor. The needs of the Walk Bridge are to increase bridge reliability, incorporate bridge redundancy, and provide a sustainable bridge design for significant weather events. 8

9 Agency Stakeholder Coordination City of Norwalk Historical Commission Connecticut Department of Energy & Environmental Protection, Office of Long Island Sound Program Connecticut Office of Policy Management Connecticut State Historic Preservation Office Federal Transit Administration National Marine Fisheries Service Norwalk Harbor Management Commission Norwalk Preservation Trust US Army Corps of Engineers US Coast Guard US Fish and Wildlife Service 9

10 Our To-Do List Improve Reliability Redundancy Resiliency REHABILITATION Strengthen and Repair Truss Members Strengthen Bridge Piers Modernize Mechanical and Electrical systems Strengthen High Towers REPLACEMENT Removal of Existing Bridge 2 Movable Spans New Bridge Spans and Piers Modern Mechanical and Electrical Systems New Rail Systems 10

11 What We Examined - Bridge and Rail Rehabilitation needs Movable span types Track alignments High tower needs Geotechnical screening Traffic impacts Right-of-way Utility impacts Construction staging 11

12 What We Examined - Navigation Navigation needs o Vertical clearance o Horizontal clearance o Channel Alignment Opening requirements Vessel collision data Maritime user needs o Norwalk Harbor Management Commission o Marinas o Other interests Channel hydraulics 12

13 What We Examined Construction Overall construction staging to limit impacts to railroad and maritime operations Identified access and staging area needs Construction adjacent to operating tracks Construction adjacent to existing bridge piers Construction adjacent to buildings/properties Seasonal limitations on in-water construction 13

14 Environmental Resources to be Evaluated Catalog resources, quantify potential impacts to resources, identify measures to avoid or minimize impacts and propose mitigation for impacts that cannot be avoided. Resources include: Traffic Air and Noise Water resources Wetlands Water quality Coastal resources T&E species Fish and Wildlife Historic/archaeologically sites Hazardous materials Energy Health and safety Environmental justice Municipal, regional plans State plan of conservation and development 14

15 15 More than 70 Options Were Considered

16 Option 14 - Rehabilitation of Existing Bridge Estimated Cost Construction Time Vertical Clearance Horizontal Clearance Channel Alignment $400 - $450 million months (estimated) Span Open: 203 feet (unchanged) Span Closed: 16 feet (unchanged) Channel clearances unchanged Unchanged 16

17 Factors to Narrowing Bridge Replacement Options Movable Span Types Navigation Clearances Counterweight Configuration Approach Span Types Substructure Types Mechanical Systems Electrical Systems Architectural Requirements Resiliency Redundancy Track Alignment 17

18 Bridge Replacement - Structure Type Study The final design and actual look of a selected bridge rehabilitation or replacement option will evolve over time. 18

19 Navigation Clearances All options increase the horizontal clearance All options increase the span-down vertical clearance All options improve channel alignment Existing Horizontal - 58 Existing Vertical - 16 (span closed) 19

20 20 Option 2G Trunnion Bascule Span

21 Option 2G Trunnion Bascule Span Estimated Cost Construction Time Vertical Clearance Horizontal Clearance Channel Alignment $350 - $400 million months (estimated) Span Open: 60 feet (minimum) Span Closed: 26 feet (approximately) feet Alignment improved 21

22 22 Option 2G Trunnion Bascule Span

23 23 Option 2G Trunnion Bascule Span

24 24 Option 3A Rolling Bascule Span

25 Option 3A Rolling Bascule Span Estimated Cost Construction Time Vertical Clearance Horizontal Clearance Channel Alignment $300 - $350 million months (estimated) Span Open: 60 feet (minimum) Span Closed: 20 feet (approximately) feet Alignment improved 25

26 26 Option 3A Rolling Bascule Span

27 27 Option 3A Rolling Bascule Span

28 28 Option 4S Rolling Bascule Truss

29 Option 4S Rolling Bascule Truss Estimated Cost Construction Time Vertical Clearance Horizontal Clearance Channel Alignment $350 - $400 million months (estimated) Span Open: 60 feet (minimum) Span Closed: 27 feet (approximately) feet Alignment improved 29

30 30 Option 4S Rolling Bascule Truss

31 31 Option 4S Rolling Bascule Truss

32 32 Option 8A Vertical Lift Span

33 Option 8A Vertical Lift Span Estimated Cost Construction Time Vertical Clearance Horizontal Clearance Channel Alignment $500 - $550 million months (estimated) Span Open: 60 feet (minimum) Span Closed: 27 feet (approximately) feet Alignment improved 33

34 34 Option 8A Vertical Lift Span

35 35 Option 8A Vertical Lift Span

36 36 Option 11C Vertical Lift Truss

37 Option 11C Vertical Lift Truss Estimated Cost Construction Time Vertical Clearance Horizontal Clearance Channel Alignment $550 - $600 million months (estimated) Span Open: 60 feet (minimum) Span Closed: 27 feet (approximately) 200 feet Alignment improved 37

38 38 Option 11C Vertical Lift Truss

39 39 Option 11C Vertical Lift Truss

40 Next Steps This summary schedule shows the broad range of The Walk Bridge Project activities that began in 2014 and will continue through The schedule will become more detailed once a preferred alternative is selected. 40

41 Ways to Stay Involved or visit CTDOT's Office of Engineering, 2800 Berlin Turnpike, Newington, CT, Monday - Friday, 8:30 a.m. to 4:30 p.m. 41

42 Ways to Stay Involved Mr. John D. Hanifin Transportation Supervising Engineer Telephone: (860) Written comments due March 10,

43 43 Ways to Stay Involved

44 44 Questions and Comments