CITY OF COLTON Local Hazard Mitigation Plan Public Review Draft September 2018 CITY OF COLTON TABLE OF CONTENTS Chapter Page Section 1. Introduction ................................................................................................................................................... 1‐1 1.1 PLAN PURPOSE .............................................................................................................................................. 1‐1 1.2 PLAN AUTHORITY ........................................................................................................................................... 1‐2 Federal Authority ............................................................................................................................. 1‐2 State Authority ................................................................................................................................. 1‐2 1.3 PLAN GOALS ................................................................................................................................................... 1‐3 1.4 UPDATES SINCE LAST PLAN ............................................................................................................................ 1‐3 1.5 PLAN PROCESS ............................................................................................................................................... 1‐3 Hazard Mitigation Planning Team .................................................................................................... 1‐4 Public Engagement ........................................................................................................................... 1‐5 Public Review Draft .......................................................................................................................... 1‐6 Plan Revision and Adoption ............................................................................................................. 1‐6 1.6 PLAN RESOURCES ........................................................................................................................................... 1‐6 Section 2. Community Profile .......................................................................................................................................... 2‐1 2.1 PHYSICAL SETTING ......................................................................................................................................... 2‐1 2.2 HISTORY ......................................................................................................................................................... 2‐1 2.3 CLIMATE ......................................................................................................................................................... 2‐5 2.4 DEMOGRAPHICS ............................................................................................................................................ 2‐5 2.5 ECONOMY AND COMMUTE PATTERNS ......................................................................................................... 2‐7 2.6 EXISTING LAND USE ....................................................................................................................................... 2‐8 2.7 DEVELOPMENT TRENDS ................................................................................................................................. 2‐9 2.8 INFRASTRUCTURE ASSESSMENT .................................................................................................................... 2‐9 Electricity .......................................................................................................................................... 2‐9 Natural Gas ....................................................................................................................................... 2‐9 Water and Wastewater .................................................................................................................. 2‐10 Transportation ............................................................................................................................... 2‐11 Section 3. Risk Assessment ............................................................................................................................................. 3‐1 3.1 HAZARD IDENTIFICATION .............................................................................................................................. 3‐1 Hazard Screening Criteria ................................................................................................................. 3‐1 Hazard Prioritization ........................................................................................................................ 3‐5 3.2 HAZARD PROFILES .......................................................................................................................................... 3‐7 Drought Profile ................................................................................................................................. 3‐7 Flood Hazard Profile ....................................................................................................................... 3‐10 Geologic Hazards ............................................................................................................................ 3‐21 Human‐Caused Hazards ................................................................................................................. 3‐26 SEISMIC Hazard Profile ................................................................................................................... 3‐32 Local Hazard Mitigation Plan | September 2018 i CITY OF COLTON Severe Weather.............................................................................................................................. 3‐47 Wildfire Hazard Profile ................................................................................................................... 3‐52 Section 4. Threat Assessment ......................................................................................................................................... 4‐1 4.1 THREAT ASSESSMENT PROCESS ..................................................................................................................... 4‐1 Key Facilities ..................................................................................................................................... 4‐1 Vulnerable Populations .................................................................................................................... 4‐5 Other Community Assets ................................................................................................................. 4‐6 4.2 THREAT PROFILES .......................................................................................................................................... 4‐6 Drought ............................................................................................................................................ 4‐6 Flooding ............................................................................................................................................ 4‐7 Geologic Hazards ............................................................................................................................ 4‐10 Human‐Caused Hazards ................................................................................................................. 4‐12 Seismic Hazards .............................................................................................................................. 4‐14 Severe Weather.............................................................................................................................. 4‐18 Wildfire ........................................................................................................................................... 4‐19 Section 5. Community Capability Assessment ............................................................................................................... 5‐22 Section 6. Mitigation Strategy ......................................................................................................................................... 6‐1 6.1 STRATEGY DEVELOPMENT PROCESS ............................................................................................................. 6‐1 Mitigation Action Foundations......................................................................................................... 6‐1 Mitigation Action Evaluation ............................................................................................................ 6‐1 Prioritization ..................................................................................................................................... 6‐3 Cost Estimates .................................................................................................................................. 6‐3 6.2 HAZARD MITIGATION ACTIONS ..................................................................................................................... 6‐3 6.3 NATIONAL FLOOD INSURANCE PROGRAM .................................................................................................. 6‐11 6.4 EXISTING MITIGATION MEASURES .............................................................................................................. 6‐12 Section 7. Plan Maintenance ..........................................................................................................................................