Alternatives Analysis for Rehabilitation and Replacement of the Tappan Zee Bridge Report,
March 2009
The Alternatives Analysis for Rehabilitation and Replacement of the Tappan Zee Bridge Report, March 2009, is to determine whether the Tappan Zee Bridge is to be rehabilitated or replaced. A series of potential options was developed and evaluated using the relevant engineering, environmental, transportation, and cost criteria. Replacement of the bridge is recommended.
- Options for a rehabilitated bridge considered allowance for transit modes on a bridge that is either rehabilitated and widened, or rehabilitated and supplemented by a parallel bridge.
- Options for a replacement bridge also considered a range of transit modes as well as a single- or dual-level structure.
.
Executive Summary (PDF, 1.4 MB)
Table of Contents (PDF, 1.8 MB)
1. Introduction (PDF, 32 KB)
Project Overview
Purpose of Report
Evaluation Process
2. Engineering Elements (PDF, 814 KB)
Introduction
Purpose & Need
Operating Criteria and Design Requirements
Condition & Assessment of Existing TZB
Work Required to Rehabilitate Existing TZB
Rehabilitation and Replacement Options
3. TZB Rehabilitation Options (PDF, 2.9 MB)
Introduction
Rehabilitation Option 1
Rehabilitation Option 2
Rehabilitation Option 3
Rehabilitation Option 4
4. TZB Replacement Options (PDF, 1.5 MB)
Replacement Option 1
Replacement Option 2
Replacement Option 3
5. Engineering Criteria (PDF, 1.2 MB)
Structural Integrity
Vulnerability
Seismicity
Redundancy
Emergency Response
Navigation Clearance
Construction Impacts
Life Span
Compliance with Design Criteria
Summary of Engineering Criteria
6. Environmental Criteria (PDF, 1.3 MB)
Displacements and Acquisitions
Historical and Archaeological Resources
Parklands and Section 4(f)
Hudson River Ecosystems and Water Resources
Visual Resources
Summary of Environmental Criteria
Other Evaluation Criteria
7. Transportation Criteria (PDF, 58 KB)
Introduction
Transit Ridership
Roadway Congestion
Transit Capacity
Travel Time
Traffic Safety
Other Evaluation Criteria
8. Cost Criteria (PDF, 7.3 MB)
Introduction
Capital Cost Estimates
Maintenance Cost Estimates
Life Cycle Cost Estimates
9. Conclusion (PDF, 49 KB)
Introduction
Existing TZB Condition, Limits and Vulnerabilities
Future Maintenance Requirements of the Existing TZB
Option Evaluation
Conclusions and Recommendations
Appendices:
Appendix A Property Impacts Drawings (cover) (PDF, 233 KB) |
|||
|---|---|---|---|
| Figure A-1 (PDF, 1.9 B) |
Figure A-2 (PDF, 2.2 MB) |
Figure A-3 (PDF, 4.5 MB) |
Figure A-4 (PDF, 2.8 MB) |
| Figure A-5 (PDF, 3.7 MB) |
Figure A-6 (PDF, 2.9 MB) |
Figure A-7 (PDF, 4.4 MB) |
Figure A-8 (PDF, 1.7 MB) |
| Figure A-9 (PDF, 4 MB) |
Figure A-10 (PDF, 2.7 MB) |
Figure A-11 (PDF, 4.4 MB) |
Figure A-12 (PDF, 2.5 MB) |
| Figure A-13 (PDF, 4.3 MB) |
|||
Appendix B Threat and Risk Assessment (PDF, 233 KB) |
|---|
Appendix C Bridge Drawings (Index) (PDF, 437 KB) |
|||
|---|---|---|---|
| Figure C-1 (PDF, 3.5 MB) |
Figure C-2 (PDF, 675 KB) |
Figure C-3 (PDF, 922 KB) |
Figure C-4 (PDF, 922 KB) |
| Figure C-5 (PDF, 858 KB) |
Figure C-6 (PDF, 334 KB) |
Figure C-7 (PDF, 258 KB) |
Figure C-8 (PDF, 613 KB) |
| Figure C-9 (PDF, 147 KB) |
Figure C-10 (PDF, 187 KB) |
Figure C-11 (PDF, 3.1 MB) |
Figure C-12 (PDF, 1.5 MB) |
| Figure C-13 (PDF, 324 KB) |
Figure C-14 (PDF, 281 KB) |
Figure C-15 (PDF, 1 MB) |
Figure C-16 (PDF, 161 KB) |
| Figure C-17 (PDF, 159 KB) |
Figure C-18 (PDF, 3 MB) |
Figure C-19 (PDF, 906 KB) |
Figure C-20 (PDF, 997 KB) |
| Figure C-21 (PDF, 132 KB) |
Figure C-22 (PDF, 160 KB) |
Figure C-23 (PDF, 3.2 MB) |
Figure C-24 (PDF, 2.8 MB) |
| Figure C-25 (PDF, 2.3 MB) |
Figure C-26 (PDF, 153 KB) |
Figure C-27 (PDF, 182 KB) |
Figure C-28 (PDF, 2.6 MB) |
| Figure C-29 (PDF, 849 KB) |
Figure C-30 (PDF, 1 MB) |
Figure C-31 (PDF, 136 KB) |
Figure C-32 (PDF, 100 KB) |
| Figure C-33 (PDF, 3.3 MB) |
Figure C-34 (PDF, 1 MB) |
Figure C-35 (PDF, 1 MB) |
Figure C-36 (PDF, 123 KB) |
| Figure C-37 (PDF, 87 KB) |
Figure C-38 (PDF, 3.2 MB) |
Figure C-39 (PDF, 1 MB) |
Figure C-40 (PDF, 993 KB) |
| Figure C-41 (PDF, 153 KB) |
Figure C-42 (PDF, 113 KB) |
||
Appendix
D |
|---|
You will need Adobe Acrobat Reader to view and print PDF documents. If you experience any problems viewing a PDF document, please download a free copy of the latest version of Acrobat Reader.
If you are unable to access a PDF file, please email your name and mailing address to tzbsite@dot.state.ny.us requesting a copy of the document.