Nez Perce Tribe Natural Hazard Mitigation Plan 2018 Revision Nez Perce Tribe Emergency Management Box 365 – 109 Lolo St Lapwai ID 83540 (208) 621-3760 Prepared By Northwest Management, Inc. - THIS PAGE INTENTIONALLY LEFT BLANK - Forward Nez Perce Tribal Emergency Management is dedicated to the protection of life, property, economic and environmental resources throughout the Reservation. Seeking to inform and educate citizens, provide training and resource coordination and ultimately reduce the vulnerability of Tribal citizens through comprehensive disaster planning and mitigation. “Hazard mitigation is sustained action to reduce or eliminate the long‐term risk to human life and property from hazards. Natural hazard mitigation planning is a process used by state, tribal, and local governments to engage stakeholders, identify hazards and vulnerabilities, develop a long-term strategy to reduce risk and future losses, and implement the plan, taking advantage of a wide range of resources. A state mitigation plan demonstrates commitment to reduce risks from natural hazards and serves as a guide for decision makers for reducing the effects of natural hazards as resources are committed”1 The Nez Perce Tribe Natural Hazard Mitigation Plan was updated in 2017-18 by the Nez Perce Tribe Hazard Mitigation Planning Committee in cooperation with Northwest Management, Inc. of Moscow, Idaho. This Plan satisfies the requirements for a local natural hazard mitigation plan under 44 CFR Part 201.6, in addition this plan fully integrated the processes of FEMA’s Natural Hazard Mitigation Plan with the Community Wildfire Protection Plan as outlined in the Healthy Forest Restoration Act. 1 Federal Emergency Management Agency. “Local Multi-Hazard Mitigation Planning Guidance.” July 1, 2008 i Table of Contents CHAPTER 1 ............................................................................................................................ 1 Background ....................................................................................................................................1 Goals and Guiding Principles ...........................................................................................................2 HMP Mission Statement ......................................................................................................... 2 Federal Emergency Management Agency Philosophy ........................................................... 2 Plan Overview ................................................................................................................................4 Update and Adoption Requirements ...............................................................................................5 CHAPTER 2 ............................................................................................................................ 7 Plan Update Process .......................................................................................................................7 Tribal Involvement .................................................................................................................. 8 Public Involvement ................................................................................................................. 9 Incorporation of Existing Plans ............................................................................................. 10 Plan Maintenance ........................................................................................................................ 11 Evaluating and Updating the Plan ......................................................................................... 11 Obtaining Continued Public Involvement ............................................................................. 12 CHAPTER 3 .......................................................................................................................... 13 History and Description of the Reservation ................................................................................... 13 Government .......................................................................................................................... 16 Demographics ....................................................................................................................... 16 Land Use and Development Trends ...................................................................................... 16 CHAPTER 4 .......................................................................................................................... 18 Risk Assessment Overview ........................................................................................................... 18 Flood Hazard Profile ..................................................................................................................... 20 Hazard Description and History ............................................................................................ 20 Probability of Future Occurrence ......................................................................................... 24 Impacts of Flood Events ........................................................................................................ 27 Value of Resources at Risk .................................................................................................... 31 ii Severe Weather Hazard Profile ..................................................................................................... 33 Drought ................................................................................................................................. 34 Hailstorms ............................................................................................................................. 37 Windstorms ........................................................................................................................... 39 Winter Storms ....................................................................................................................... 41 Landslide Hazard Profile ............................................................................................................... 45 Hazard Description and History ............................................................................................ 45 Probability of Future Occurrence ......................................................................................... 47 Impacts of Landslide Events .................................................................................................. 48 Value of Resources at Risk .................................................................................................... 48 Wildland Fire Profile ..................................................................................................................... 50 Wildland Fire Characteristics ................................................................................................ 50 History and Extent................................................................................................................. 52 Wildland Fire Risk .................................................................................................................. 57 Volcanic Eruption Profile .............................................................................................................. 69 Hazard Description and History ............................................................................................ 69 Probability of Future Occurrence ......................................................................................... 72 Impacts of Volcanic Eruption ................................................................................................ 73 Value of Resources at Risk .................................................................................................... 74 Hazardous Materials .................................................................................................................... 75 Hazard Description and History ............................................................................................ 75 Probability of Future Occurrence ......................................................................................... 76 Impacts of Hazardous Materials Release .............................................................................. 77 Values of Resources at Risk .................................................................................................. 77 Vulnerable Areas and Infrastructure ............................................................................................. 80 Residential Structures ........................................................................................................... 81 Critical Infrastructure ............................................................................................................ 83 Cultural and Sacred Sites ...................................................................................................... 85 CHAPTER 5 .......................................................................................................................... 86 iii Mitigation Strategy ...................................................................................................................... 86 Mitigation Goals .................................................................................................................... 86 Mechanisms to Incorporate Mitigation Strategies ..............................................................