2019 CITY OF GUSTAVUS HAZARD MITIGATION PLAN CITY OF GUSTAVUS HAZARD MITIGATION PLAN TABLE OF CONTENTS 1.0 INTRODUCTION ........................................................................................................................... 1-1 1.1 HAZARD MITIGATION PLANNING .......................................................................................... 1-1 1.2 2019 ALL-HAZARDS MITIGATION PLAN SYNOPSIS ................................................................ 1-1 2.0 PLANNING PROCESS ................................................................................................................. 2-1 2.1 OVERVIEW OF THE LHMP PLANNING PROCESS ................................................................... 2-1 2.2 OPPORTUNITIES FOR STAKEHOLDERS ................................................................................. 2-2 2.3 PUBLIC INVOLVEMENT ......................................................................................................... 2-3 2.4 REVIEW AND INCORPORATION OF EXISTING PLANS AND REPORTS ........................................ 2-4 2.5 INTEGRATING HMP PRECEPTS INTO EXISTING PLANNING MECHANISMS ................................ 2-5 2.6 CONTINUED PUBLIC INVOLVEMENT ...................................................................................... 2-5 2.7 PLAN UPDATE AND MONITORING METHOD ........................................................................... 2-5 3.0 COMMUNITY PROFILE ............................................................................................................... 3-1 3.1 PLANNING AREA ................................................................................................................. 3-1 3.2 DEMOGRAPHICS AND ECONOMY .......................................................................................... 3-2 3.3 LAND USE AND DEVELOPMENT TRENDS ............................................................................... 3-3 4.0 HAZARD ANALYSIS .................................................................................................................... 4-1 4.1 EARTHQUAKE ..................................................................................................................... 4-3 4.1.1 Nature/Type ........................................................................................................ 4-3 4.1.2 Location ............................................................................................................... 4-4 4.1.3 History ................................................................................................................. 4-5 4.1.4 Extent/Impact ...................................................................................................... 4-6 4.1.5 Recurrence Probability ........................................................................................ 4-7 4.2 FLOOD AND EROSION ......................................................................................................... 4-8 4.2.1 Nature/Type ........................................................................................................ 4-8 4.2.2 Location ............................................................................................................. 4-10 4.2.3 History ............................................................................................................... 4-11 4.2.4 Extent/Impact .................................................................................................... 4-11 4.2.5 Recurrence Probability ...................................................................................... 4-13 4.3 SEVERE WEATHER ........................................................................................................... 4-13 4.3.1 Nature/Type ...................................................................................................... 4-13 4.3.2 Location ............................................................................................................. 4-15 4.3.3 History ............................................................................................................... 4-15 4.3.4 Extent/Impact .................................................................................................... 4-17 4.3.5 Recurrence Probability ...................................................................................... 4-18 4.4 TSUNAMI AND SEICHE ....................................................................................................... 4-18 4.4.1 Nature/Type ...................................................................................................... 4-18 4.4.2 Location ............................................................................................................. 4-19 4.4.3 History ............................................................................................................... 4-19 4.4.4 Extent/Impact .................................................................................................... 4-19 4.4.5 Recurrence Probability ...................................................................................... 4-20 4.5 WILDLAND FIRE ................................................................................................................ 4-20 2019 PAGE | ii CITY OF GUSTAVUS HAZARD MITIGATION PLAN 4.5.1 Nature/Type ...................................................................................................... 4-20 4.5.2 Location ............................................................................................................. 4-21 4.5.3 History ............................................................................................................... 4-21 4.5.4 Extent, Impact, and Recurrence Probability ..................................................... 4-21 4.5.5 Recurrence Probability ...................................................................................... 4-22 4.6 VULNERABILITY ASSESSMENT ........................................................................................... 4-22 4.6.1 Asset Inventory – Critical Facilities ................................................................... 4-23 4.6.2 Vulnerability ....................................................................................................... 4-26 5.0 MITIGATION STRATEGY ............................................................................................................ 5-1 5.1 AUTHORITIES, POLICIES, PROGRAMS, AND RESOURCES ....................................................... 5-1 5.2 NATIONAL FLOOD INSURANCE PROGRAM PARTICIPATION ..................................................... 5-3 5.3 MITIGATION GOALS ............................................................................................................ 5-3 5.4 IDENTIFYING MITIGATION ACTIONS ...................................................................................... 5-3 5.5 MITIGATION ACTION PLAN ................................................................................................... 5-7 5.6 IMPLEMENTING MITIGATION STRATEGY INTO EXISTING PLANNING MECHANISMS .................... 5-8 5.7 MONITORING MITIGATION STRATEGY PROGRESS ................................................................. 5-9 5.8 PROGRESS IN LOCAL MITIGATION EFFORTS ......................................................................... 5-9 6.0 REFERENCES .............................................................................................................................. 6-1 7.0 JURISDICTIONAL ADOPTION .................................................................................................... 7-1 Appendix A Public Participation and Planning Process Documentation Appendix B Plan Maintenance Tools 2019 PAGE | iii CITY OF GUSTAVUS HAZARD MITIGATION PLAN LIST OF FIGURES Figure 1. Gustavus Overview Map ......................................................................................................... 3-1 Figure 2. Gustavus Historic Population ................................................................................................. 3-2 Figure 3. Photograph from Gustavus docks ......................................................................................... 3-3 Figure 4. Alaska’s Neotechtonic Map of Alaska, Gustavus Area ........................................................ 4-5 Figure 5. Gustavus Earthquake Perception Map .................................................................................. 4-7 Figure 6. City of Gustavus Earthquake Probability .............................................................................. 4-8 Figure 7. City of Gustavus Scour Locations ....................................................................................... 4-11 Figure 8. Statewide Rainfall Map .......................................................................................................... 4-15 Figure 9. Historic and Predicted Temperatures for Gustavus........................................................... 4-17 Figure 8. Historic and Predicted Temperatures for Gustavus........................................................... 4-17 Location, Figure 9. Gustavus Area Historic Wildfires ........................................................................ 4-21 LIST OF TABLES Table 1. Hazard Mitigation Planning Team ............................................................................................ 2-2 Table 2. Public Involvement Mechanisms ............................................................................................