The results of the AASHTO vessel collision risk assessment conducted by M&N concluded that the Bay Bridge does not meet the AASHTO risk threshold for new bridges (whether classified typical or critical).
Risk Reduction Plan and Implementation
Risk Reduction Plan
Based on results of the AASHTO analysis, MDTA developed a comprehensive risk reduction plan that includes short-term and long-term strategies for reducing risk, such as bridge operational procedures, recommended best practices for vessel transits under the Bay Bridge, and physical protection measures. Short-term strategies include updated communication protocols for vessel pilots, reduced vessel speeds, one-way transits, and methods to manage vehicular traffic on the bridge. Long-term strategies include measures such as physical protection (i.e. the Bay Bridge Protection Project detailed below) and the on-going Chesapeake Bay Crossing Study Tier 2 National Environmental Policy Act (NEPA) project for bridge replacement. While it is not feasible to retrofit the existing Bay Bridge to meet AASHTO’s requirements for new bridges, given the advanced stage of planning for a new Chesapeake Bay Crossing along the current corridor, the MDTA continues to focus on that option as the best path forward to reducing the risk of a vessel strike.
Implementation
Following the AASHTO study, MDTA has initiated detailed analysis and further refinement of the risk analysis and the design of potential physical protection measures. MDTA will continue to coordinate with local representatives from the USCG and the USACE concerning risk reduction at the Bay Bridge and the new Key Bridge. Risk reduction measures will be coordinated and reviewed by FHWA, USCG, and USACE. The MDTA issued a set of recommended best practices to waterway users that included operational recommendations in the area of the Bay Bridge for speed reductions, one-way passage of large vessels, and separation between vessels. The MDTA is developing the Bay Bridge Protection Project for physical protection measures at the Bay Bridge to add to what is currently in place. This will provide enhanced protection that will reduce the risk from vessel allision. On-going design work includes advancing to a 30% design of the proposed protection structures, further optimizing the physical protection measures, preparation of procurement documents, and geotechnical investigations. Estimated Costs and Funding Sources Needed The MDTA’s vessel collision risk assessment for the Bay Bridge was funded by toll revenues. The Bay Bridge Protection Project under development would advance bridge protection activities in phases to ensure a state of good repair and resiliency.
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