Beaverhead County, City of Dillon and Town of Lima, the Updated Plan in 2009, and the Current Update
Total Page:16
File Type:pdf, Size:1020Kb
BEAVERHEAD COUNTY, MONTANA CITY OF DILLON, MONTANA TOWN OF LIMA, MONTANA PRE-DISASTER MITIGATION PLAN DECEMBER 2017 UPDATE TOPICAL REPORT RSI-2703 PREPARED FOR Beaverhead County, Montana City of Dillon, Montana Town of Lima, Montana DECEMBER 2017 respec.com BEAVERHEAD COUNTY, MONTANA CITY OF DILLON, MONTANA TOWN OF LIMA, MONTANA PRE-DISASTER MITIGATION PLAN DECEMBER 2017 REVISION TOPICAL REPORT RSI-2703 PREPARED BY RESPEC 3110 Valley Commons Drive, Suite 4 Bozeman, Montana 59718 PREPARED FOR Beaverhead County, Montana City of Dillon, Montana Town of Lima, Montana DECEMBER 2017 respec.com EXECUTIVE SUMMARY While disasters can strike at any time in any place, in many cases, actions can be taken before disasters strike to reduce or eliminate the negative impacts. These actions are termed mitigation and often protect life, property, the economy, and other values. The Beaverhead County Pre-Disaster Mitigation (PDM) Plan addresses 13 major hazards with respect to risk and vulnerabilities countywide, including the City of Dillon and the Town of Lima. Through a collaborative planning process, the Beaverhead County hazards were identified, researched, profiled, updated, and prioritized. The major hazards (i.e., aircraft accident, disease and environmental contamination, drought, earthquake, flood, hazardous material release, severe weather, terrorism and civil unrest, transportation accident, urban fire, utility and energy failure, volcanic ash fall, and wildfire) are each profiled in terms of their hazard description, history, probability and magnitude, mapping, vulnerabilities, data limitations, and other factors. The vulnerabilities to critical facilities; critical infrastructure; structures; the population; economic, ecologic, historic, and social values; and future development are updated for each hazard. Based on the probability and extent of potential impacts that were identified in the risk assessment, the hazard prioritizations in Beaverhead County are displayed in Table ES-1. Note that individual jurisdictions have their own prioritizations based on the hazards and vulnerabilities specific to their locations but are generally similar to that of the county. Table ES-1. Beaverhead County Hazard Prioritizations Level Hazard Earthquake Flood High Hazard Wildfire Severe Weather Utility and Energy Failure Disease and Environmental Contamination Hazardous Material Moderate Hazard Release Drought Urban Fire Terrorism and Civil Unrest Volcanic Ashfall Low Hazard Aircraft Accident Transportation Accident The following goals are outlined in the plan’s mitigation strategy, based on the results of the risk assessment: / Goal 1: Reduce risks from all hazards through comprehensive mitigation activities / Goal 2: Reduce impacts from flooding / Goal 3: Minimize risk of wildfire at the urban interface / Goal 4: Reduce risk of hazardous material incidents i / Goal 5: Reduce risk of disease, environmental hazards, and terrorist acts / Goal 6: Reduce impact of earthquakes / Goal 7: Reduce impact of countywide weather hazards such as drought and winter weather / Goal 8: Minimize impact of aircraft incidents / Goal 9: Continue to emphasize preparedness, response, and recovery activities in all types of emergency management planning. Objectives and mitigation actions that range from adopting building codes to burying electric infrastructure to community education are associated with each of the goals. The mitigation projects are prioritized based on cost, staff time, feasibility, population benefit, property benefit, values benefit, project maintenance, and the probability and impact of the hazards being mitigated. An implementation plan outlines the suggested course of action, given the limited resources available to Beaverhead County and the jurisdictions. The Beaverhead County Local Emergency Planning Committee is responsible for implementing and maintaining the plan. Other recommended activities, such as integrating this plan into a variety of county, city, and town plans, regulations, and documents, will further the goals of hazard mitigation in Beaverhead County. The Beaverhead County plan exceeds the requirements of a local hazard mitigation plan as outlined in the Interim Final Rule published in the Federal Register on February 26, 2002, at Title 44 of the Code of Federal Regulations, Part 201 as part of the Disaster Mitigation Act of 2000 (DMA 2000). This plan has been approved by the Federal Emergency Management Agency (FEMA) as a hazard mitigation plan; therefore, the county, city, and town may be eligible for federal mitigation funds. This plan serves as a guide for understanding the major hazards that Beaverhead County and its jurisdictions face. This plan also provides a strategy for preventing or reducing some of the impacts. ii TABLE OF CONTENTS 1.0 INTRODUCTION ................................................................................................................................................................ 1 1.1 Purpose .................................................................................................................................................................................................... 1 1.2 Authorities ............................................................................................................................................................................................... 1 1.3 Acknowledgements ............................................................................................................................................................................... 2 1.4 County and Jurisdictional Profile ...................................................................................................................................................... 2 1.5 Plan Scope and Organization ............................................................................................................................................................. 5 2.0 PLANNING PROCESS AND METHODOLOGIES................................................................................................................ 7 2.1 Initial Planning Process ........................................................................................................................................................................ 7 2.2 Plan Update Process 2016 ................................................................................................................................................................. 8 2.3 Risk Assessment Methodologies ....................................................................................................................................................... 10 2.4 Hazard Identification ............................................................................................................................................................................ 13 3.0 ASSETS AND COMMUNITY INVENTORY ......................................................................................................................... 15 3.1 Critical Facilities and Infrastructure .................................................................................................................................................. 15 3.2 Population and Structures .................................................................................................................................................................. 19 3.3 Economic, Ecologic, Historic, and Social Values ........................................................................................................................... 20 3.4 Current Land Use ................................................................................................................................................................................... 23 3.5 New Development.................................................................................................................................................................................. 23 3.6 Future Development ............................................................................................................................................................................. 25 4.0 RISK ASSESSMENT/HAZARD PROFILES ......................................................................................................................... 27 4.1 Aircraft Accidents .................................................................................................................................................................................. 27 4.2 Disease and Environmental Contamination ................................................................................................................................... 30 4.3 Drought .................................................................................................................................................................................................... 41 4.4 Earthquake .............................................................................................................................................................................................. 49 4.5 Flood ......................................................................................................................................................................................................... 56 4.6 Hazardous Material Release ..............................................................................................................................................................