Wyoming Region 6 Park County Washakie County Hot Springs County Big Horn County Regional Hazard Mitigation Plan DRAFT August 2016 Developed by Washakie, Hot Springs, Park and Big Horn Counties DRAFT With professional planning assistance from Amec Foster Wheeler Environment & Infrastructure, Inc. Hazard Mitigation and Emergency Management Program Table of Contents Chapters Chapter 1 – Introduction ...........................................................................................................1.1 1.1 Purpose ..............................................................................................................................1.1 1.2 Background and Scope .....................................................................................................1.1 1.3 Plan Organization..............................................................................................................1.2 1.4 Multi-Jurisdtional Planning ..............................................................................................1.3 Chapter 2 – Community Profile ................................................................................................2.1 2.1 Geography and Climate ....................................................................................................2.1 2.2 Population .........................................................................................................................2.3 2.3 Economy ...........................................................................................................................2.3 Chapter 3 – Planning Process ....................................................................................................3.1 3.1 Background on Mitigation Planning in the Region ..........................................................3.1 3.2 Local Government Participation .......................................................................................3.3 3.3 The 10-Step Planning Process ..........................................................................................3.3 3.3.1 Phase 1: Organize Resources ...................................................................................3.5 3.3.2 Phase 2: Assess Risks ............................................................................................3.15 3.3.3 Phase 3: Develop the Mitigation Plan ....................................................................3.15 3.3.4 Phase 4: Implement the Plan and Monitor Progress ..............................................3.16 Chapter 4 –Hazard Analysis and Risk Assessment .................................................................4.1 4.1 Hazard Identification ................................DRAFT........................................................................4.2 4.1.1. Results and Methodology .......................................................................................4.2 4.1.2 Disaster Declaration History ....................................................................................4.4 4.2 Hazard Profiles..................................................................................................................4.7 4.2.1 Profile Methodology ................................................................................................4.7 4.2.2 Avalanche ................................................................................................................4.9 4.2.3 Dam Failure ...........................................................................................................4.15 4.2.4 Drought ..................................................................................................................4.23 4.2.5 Earthquake .............................................................................................................4.43 4.2.6 Expansive Soils ......................................................................................................4.63 4.2.7 Extreme Cold .........................................................................................................4.69 4.2.8 Flood ......................................................................................................................4.74 4.2.9 Hailstorm................................................................................................................4.90 4.2.10 Hazardous Materials ............................................................................................4.95 Region 6 DRAFT i Regional Hazard Mitigation Plan 2016 4.2.11 High Winds and Downbursts .............................................................................4.100 4.2.12 Landslide/Rockfall/Debris Flow ........................................................................4.106 4.2.13 Lightning ............................................................................................................4.116 4.2.14 Mine Subsidence ................................................................................................4.121 4.2.15 Tornado ..............................................................................................................4.125 4.2.16 Severe Winter Weather ......................................................................................4.135 4.2.17 Wildfire ..............................................................................................................4.140 Chapter 5 – Mitigation Strategy ................................................................................................5.1 5.1 Mitigation Strategy: Overview .........................................................................................5.1 5.2 Goals and Objectives ........................................................................................................5.1 5.3 Identification and Analysis of Mitigation Actions............................................................5.4 5.3.1 Prioritization Process ...............................................................................................5.5 5.4 Mitigation Action Plan ......................................................................................................5.7 5.4.1 Progress on Previous Mitigation Actions ................................................................5.7 5.4.2 Continued Compliance with NFIP ...........................................................................5.7 5.4.3 Mitigation Action Plan .............................................................................................5.8 Chapter 6 – Plan Adoption, Implementation, and Maintenance............................................6.1 6.1 Formal Plan Adoption .......................................................................................................6.1 6.2 Implementation .................................................................................................................6.1 6.2.1 Role of the Hazard Mitigation Planning Committee in Implementation and Maintenance .............................................................................................................6.2 6.3 Maintenance ......................................................................................................................6.3 6.3.1 Maintenance Schedule .............................................................................................6.3 6.3.2 Maintenance Evaluation Process .............................................................................6.3 6.3.3 Incorporation into Existing Planning Mechanisms ..................................................6.4 6.3.4 Continued Public InvolvementDRAFT ................................................................................6.5 Region 6 DRAFT ii Regional Hazard Mitigation Plan 2016 2016 County Planning Annexes Washakie County Planning Annex Hot Springs County Planning Annex Park County Planning Annex Big Horn County Planning Annex - 2015 Hazard Mitigation Plan Appendixes Appendix A – County Hazard Mitigation Planning Committee Members Appendix B – Region 6 Landslide Attachment Appendix C - Planning Process Documentation Appendix D – Washakie County Flood Chapter Update 2013 Appendix E – Records of Adoption (electronic) Appendix F – Critical Facility Details (electronic) DRAFT Region 6 DRAFT iii Regional Hazard Mitigation Plan 2016 2016 EXECUTIVE SUMMARY This plan is the product of a 2016 planning process undertaken by the four counties in the Big Horn Basin in Wyoming Office of Homeland Security Region 6 – Big Horn, Park, Hot Springs and Washakie. The purpose is to meet the requirements of the Disaster Mitigation Act of 2000 (PL 106-390), and thereby maintain continued eligibility for certain Hazard Mitigation – or disaster loss reduction – programs from the Federal Emergency Management Agency (FEMA). This plan updates existing hazard mitigation plans for Washakie and Park counties, and serves as a new hazard mitigation plan for Hot Springs County. Big Horn County had updated its hazard mitigation plan in late 2015 and adopted it in 2016, thus it is included in its entirety as an annex to this plan. The process followed a methodology that adheres to FEMA guidance. It consisted of two levels of planning teams; a coordinating planning team comprised of the County Emergency Management Coordinators, and four local government teams – one in each county. Every municipality within each county was invited to participate. The planning process examined the recorded history of losses resulting from natural hazards, and analyzed the future risks posed to each county by these