ST. MARY PARISH HAZARD MITIGATION PLAN Plan Update 2020 Prepared for St. Mary Parish ST. MARY PARISH HAZARD MITIGATION PLAN Table of Contents Foreword......................................................................................................................... I. Section One – Parish Background and Planning Process .............................................. 1-1 Geographic Setting ........................................................................................................................... 1-1 Land Use Overview ................................................................................................................... 1-3 Socioeconomic Factors..................................................................................................................... 1-4 The Planning Process ............................................................................................................... 1-6 Plan Maintenance Procedures .............................................................................................. 1-10 Section Two – Hazard Identification and Parish-Wide Risk Assessment ....................... 2-1 Previous Occurrences ....................................................................................................................... 2-2 Multi-Jurisdictional Risk ................................................................................................................... 2-4 Parish Essential Facilities ................................................................................................................... 2-6 Critical Facilities ...................................................................................................................... 2-12 Levee System ........................................................................................................................... 2-14 Land Use ............................................................................................................................................ 2-19 Identified Hazards ................................................................................................................... 2-22 Flooding ................................................................................................................................... 2-23 Repetitive Loss Properties ........................................................................................ 2-34 National Flood Insurance Program ......................................................................... 2-38 Hurricane/Tropical Storms .................................................................................................... 2-41 Severe Winter Storm .............................................................................................................. 2-53 Tornado .................................................................................................................................... 2-56 Thunderstorm (Lightning, Severe Wind, Hail) ................................................................... 2-60 Coastal Erosion ....................................................................................................................... 2-67 Drought .................................................................................................................................... 2-72 Future Land Use & Community Trends ........................................................................................ 2-75 Multi-Jurisdictional Risk Descriptions ........................................................................................... 2-76 Baldwin ..................................................................................................................................... 2-78 Berwick ..................................................................................................................................... 2-78 Chitimacha Tribe of LA .......................................................................................................... 2-78 Franklin ..................................................................................................................................... 2-79 ST. MARY PARISH HAZARD MITIGATION PLAN Patterson .................................................................................................................................. 2-80 Morgan City ............................................................................................................................. 2-80 Unincorporated Areas – Amelia and Cypremort Point ..................................................... 2-80 Section Three – Mitigation Strategy.............................................................................. 3-1 Planning and Regulatory .................................................................................................................. 3-2 Capacity Assessment ......................................................................................................................... 3-2 Specific Mitigation Actions and Projects........................................................................................ 3-4 Updated St. Mary Parish Project List 2014 .................................................................................... 3-6 Identifiable Action Items ................................................................................................................. 3-13 St. Mary Parish Project List 2020 - Ongoing ................................................................................ 3-23 St. Mary Parish Project List 2020 - Completed ............................................................................ 3-24 St. Mary Parish Project List 2020 - Completed ............................................................................ 3-24 Parish Priority Projects ..................................................................................................................... 3-25 Section Four – Chitimacha Tribe Addendum ................................................................. 4-1 Appendix A – Planning Process ......................................................................................... St. Mary Parish Hazard Mitigation Plan Update Committee ....................................................... A-1 Notification, Sign-in, and Meeting Agendas ....................................................................................... Meeting One – Kickoff + PowerPoint Presentation ............................................................ A-2 Meeting Two – Risk Assessment ............................................................................................ A-3 Stakeholder Meetings ........................................................................................ Attachment A-4 Meeting Three – Mitigation Goals, Strategies, and Maintenance .................................... A-5 Meeting Four – Draft Plan Elements ...................................................................................... A-6 Appendix B – Risk Assessment .......................................................................................... PowerPoint Presentation ................................................................................................................. B-1 Base Map ............................................................................................................................................. B-2 Waterways Map .................................................................................................................................. B-3 Levees, Pump Stations, & Drainage Basins Map .......................................................................... B-4 Land Use Map ..................................................................................................................................... B-5 Critical Facilities List & Maps ...................................................................................... Attachment B-6 Inundations ......................................................................................................................................... B-7 Composite Risk Areas ................................................................................................. Attachment B-8 Baldwin - Composite Risk Areas ............................................................................................. B-8 Berwick - Composite Risk Areas ............................................................................................. B-8 ST. MARY PARISH HAZARD MITIGATION PLAN Chitimacha Tribe - Composite Risk Areas ............................................................................ B-8 Franklin - Composite Risk Areas ............................................................................................. B-8 Morgan City - Composite Risk Areas ..................................................................................... B-8 Patterson - Composite Risk Areas .......................................................................................... B-8 Levee Failure Inundation ............................................................................................ Attachment B-9 Baldwin - Levee Failure Inundation ....................................................................................... B-9 Berwick - Levee Failure Inundation ........................................................................................ B-9 Chitimacha Tribe - Levee Failure Inundation ......................................................................