RESOLUTION NO. 14-20 A RESOLUTION OF THE SCAPPOOSE CITY COUNCIL ADOPTING THE UPDATED COLUMBIA COUNTY MULTI-JURISDICTIONAL HAZARD MITIGATION PLAN FOR THE CITY OF SCAPPOOSE WHEREAS, the Federal Emergency Management Agency (FEMA) requires municipalities to adopt Hazard Mitigation Plans in order to be eligible for FEMA funding in the event of future disasters; and WHEREAS, the City of Scappoose adopted a Hazard Mitigation Plan through Resolution No. 14-15; and WHEREAS, the City of Scappoose, Columbia County, and other county municipalities have since updated the Hazard Mitigation Plan; and WHEREAS, FEMA has approved the final draft of the Columbia County Multi-Jurisdictional Hazard Mitigation Plan; and WHEREAS, the Columbia County Multi-Jurisdictional Hazard Mitigation Plan for the City of Scappoose, and attached hereto as Appendix G, has been reviewed by residents, business owners, and federal, state, and local agencies and has been revised to reflect their concerns, NOW, THEREFORE, THE CITY OF SCAPPOOSE COUNCIL RESOLVES AS FOLLOWS: Section 1; The Columbia County Multi-Jurisdictional Hazard Mitigation Plan for the City of Scappoose, and attached hereto as Appendix G, is hereby adopted as an official plan of the City of Scappoose. Section 2: Resolution No. 14-15 is hereby rescinded and replaced. PASSED AND ADOPTED by the City Council of Scappoose and signed by me, and the City Recorder in authentication of its passage this 15 th day of September, 2014. CITY OF SCAPPOOSE, OREGON Attest: Resolution 14-20 2014 __________________________ Columbia County Multi-Jurisdiction Hazard Mitigation Plan Including the Cities: Clatskanie Columbia City Prescott Rainier St. Helens Scappoose Vernonia Columbia County Department of Emergency Management TABLE OF CONTENTS 1. INTRODUCTION .............................................................................................................. 1-1 1.1 Hazard Mitigation Planning ..................................................................... 1-1 1.2 Planning Requirements ............................................................................ 1-1 1.2.1 Local Mitigation Plans ................................................................. 1-1 1.3 Grant Programs Requiring Hazard Mitigation Plans ............................... 1-2 1.3.1 Disaster Funded Mitigation Assistance ....................................... 1-2 1.3.2 Hazard Mitigation Assistance Programs ...................................... 1-2 1.4 Multi-Jurisdictional Hazard Mitigation Plan Description ....................... 1-3 2. PREREQUISITES ............................................................................................................ 2-1 2.1 Adoption by Local Governing Bodies and Supporting Documentation ......................................................................................... 2-1 3. COMMUNITY DESCRIPTION .......................................................................................... 3-1 3.1 Location, Geography, and History ........................................................... 3-1 3.2 Demographics .......................................................................................... 3-1 3.2.1 Columbia County ......................................................................... 3-1 3.2.2 City of Clatskanie ........................................................................ 3-2 3.2.3 Columbia City .............................................................................. 3-2 3.2.4 City of Prescott ............................................................................ 3-3 3.2.5 City of Rainier.............................................................................. 3-3 3.2.6 City of St. Helens ......................................................................... 3-3 3.2.7 City of Scappoose ........................................................................ 3-3 3.2.8 City of Vernonia .......................................................................... 3-4 3.3 Development ............................................................................................ 3-4 4. PLANNING PROCESS .................................................................................................... 4-1 4.1 Overview of Planning Process ................................................................. 4-2 4.1.1 Initial Planning Processes, 1998-2005 ......................................... 4-2 4.1.2 2009 Plan Update ......................................................................... 4-2 4.1.3 2014 Hazard Mitigation Plan Update .......................................... 4-3 4.2 Hazard Mitigation Steering committees .................................................. 4-4 4.2.1 Formation of the Committees ...................................................... 4-4 4.2.2 Planning Team Meetings and Tasks ............................................ 4-6 4.3 Public Involvement .................................................................................. 4-7 4.3.1 Project Introduction ..................................................................... 4-7 4.3.2 Public planning efforts ................................................................. 4-7 4.4 Incorporation of Existing Plans and Other Relevant Information ........... 4-8 5. HAZARD PROFILES ....................................................................................................... 5-1 Columbia County Multi-Jurisdictional Hazard Mitigation Plan – May 2014 Draft i TABLE OF CONTENTS 5.1 Overview of a Hazard Analysis ............................................................... 5-1 5.2 Hazard Identification and Screening ........................................................ 5-1 5.3 Hazard Profile .......................................................................................... 5-5 5.3.1 Flood ............................................................................................ 5-5 5.3.2 Winter Storm .............................................................................. 5-11 5.3.3 Landslide .................................................................................... 5-14 5.3.4 Wildfires .................................................................................... 5-17 5.3.5 Earthquake ................................................................................. 5-23 5.3.6 Volcano ...................................................................................... 5-26 5.3.7 Wind ........................................................................................... 5-29 5.3.8 Erosion ....................................................................................... 5-31 5.3.9 El Niño/Southern Oscillation ..................................................... 5-35 5.3.10 Expansive Soils .......................................................................... 5-37 5.3.11 Drought ...................................................................................... 5-39 5.3.12 Dam/Levee Failure..................................................................... 5-41 5.3.13 Disruption of Utility and Transportation Systems ..................... 5-44 5.3.14 Hazardous Materials .................................................................. 5-49 5.3.15 Terrorism.................................................................................... 5-56 5.3.16 Infectious Disease Epidemic ...................................................... 5-58 6. VULNERABILITY ANALYSIS .......................................................................................... 6-1 6.1 Overview of Vulnerability Analysis ........................................................ 6-1 6.2 Vulnerability Analysis: Specific Steps .................................................... 6-2 6.2.1 Asset Inventory ............................................................................ 6-2 6.2.2 Methodology ................................................................................ 6-5 6.2.3 Data Limitations........................................................................... 6-6 6.2.4 Exposure Analysis ....................................................................... 6-6 6.2.5 Areas of Future Development ...................................................... 6-6 7. MITIGATION STRATEGY ................................................................................................ 7-1 7.1 Developing Mitigation Goals ................................................................... 7-1 7.2 Identifying Mitigation Actions ................................................................ 7-2 7.3 Evaluating and Prioritizing Mitigation Actions ....................................... 7-4 7.4 Implementing a Mitigation Action Plan .................................................. 7-5 8. PLAN MAINTENANCE .................................................................................................... 8-1 8.1 Monitoring, Evaluating, and Updating the MHMP ................................. 8-1 8.2 Implementation Through Existing Planning Mechanisms ....................... 8-3 8.3 Continued Public Involvement ................................................................ 8-4 Columbia County Multi-Jurisdictional Hazard Mitigation Plan – May 2014 Draft ii TABLE OF CONTENTS List of Appendices Appendix A Columbia County Appendix B City of Clatskanie Appendix C Columbia City Appendix D City of Prescott Appendix E City of Rainier Appendix F City of St. Helens Appendix G City of Scappoose Appendix H City of Vernonia Appendix I Hazard Maps Appendix