Lane County Multi-Jurisdiction Hazard Mitigation Plan

Transcription

1 Lane County Multi-Jurisdiction Hazard Mitigation Plan Version 5.0 (September 2018 September 2023) LANE COUNTY, CITY OF COBURG, CITY OF CRESWELL, DUNES CITY, CITY OF FLORENCE, CITY OF OAKRIDGE, CITY OF VENETA, CITY OF WESTFIR Developed by the Lane County Hazard Mitigation & Emergency Management Steering Committee, in accordance with PUBLIC LAW (Robert T. Stafford Disaster Relief and Emergency Assistance Act), as amended, 42 U.S.C ; PUBLIC LAW (Disaster Mitigation Act of 2000); et al.

2 This page intentionally left blank

3 Table of Contents List of Figures... vi List of Tables... viii Acronyms and abbreviations... ix Executive Summary... xi Planning Process... xi Hazard Identification and Risk Assessment... xii Mitigation Strategy... xii Future Updates... xiii 1. Introduction Mitigation Planning Background Authorities Local Adoption Document Structure Multi-Jurisdiction Hazard Mitigation Plan - V Naming Convention - Subsequent Versions Participating Jurisdictions Current Plan Participants Future Plan Participants Lane County Profile Statewide Context, Natural Hazards Mitigation Disaster Declaration History County Overview Demographics and Economy Geography and Climate Overview Participating City Profiles City Demographic Profiles Regional Maps, Participating Cities Planning Process Hazard Mitigation & Emergency Management Steering Committee Planning Meetings Lane County Planning Process: Cycle Multi-Jurisdiction Planning Process LANE COUNTY OREGON MULTI-JURISDICTION HAZARD MITIGATION PLAN Page i

4 2.3 Public Involvement in Planning Process Public Involvement Campaign Public Involvement Survey: Findings Plan Document Viewing, Comment Opportunities Risk Assessment Identifying Hazards Hazard Analysis Scoring (Quantification) Definitions of Hazard Classifications Data Sources, Technical Reports, and Data Limitations Hazard Profiles Dam Failure Drought Earthquake Flood Hazardous Materials Incident Landslide Pandemic Tsunami Wildfire Windstorm Winter Storm Volcano Vulnerability Assessment Overall Vulnerability per Hazard Type Hazard Vulnerability per Geographic Region Risk Assessment, Participating Cities, Distinguishing Characteristics NFIP & Repetitive Flood Claims Critical Facilities and Lifelines Population Vulnerability Assessment Structure Vulnerability Assessment Potential Dollar Loss Mitigation Strategy Local Hazard Mitigation Mission and Goals Coordinated Mitigation Strategies - Implementation Capabilities LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page ii

5 4.2.1 National Flood Insurance Program Participation/Compliance NFIP - Community Rating System (CRS) Building Codes Planning & Zoning, Goal 7, Land Divisions & Open Space Wildfire Protection / Firewise Program Public Health Emergency Preparedness Action Item Identification and Prioritization Action Item Prioritization Vetting Process Action Item Prioritization Criteria and Formula Hazard Mitigation Action Items Previous Mitigation Actions and Progress Report Lane County: New Mitigation Actions Participating City Hazard Mitigation Actions Plan Maintenance Adoption Implementation, Monitoring, Evaluation, Update Incorporation into Existing and Future Planning Mechanisms Continued Public Involvement Appendices Appendix A. Adoption Documents Appendix B. Meeting Notes and Announcements ( Cycle) Appendix C. Previous Planning Cycle ( ) C.1 Planning Process Cycle C.2 Previous Action Item Status Report ( Cycle) C.3 Notes and Correspondence ( Cycle) C.4 Data Collection Cycle C.5 Grant Funded Mitigation Projects Appendix D. Public Engagement Comments D.1 Goals Priority Ranking D.2 Hazards Priority Ranking D.3 Strategy Priority Ranking Annexes Annex 1 - City of Coburg... 1 Introduction... 1 LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page iii

6 Hazard Mitigation Meetings and Work Sessions... 2 City of Coburg: Hazard Quantification... 3 Individual Hazard Discussions... 5 Mitigation Projects Hazard Mitigation Plan Implementation and Maintenance Annex 2 - City of Creswell... 1 Introduction: City of Creswell Hazard Mitigation Reference... 1 City of Creswell: Hazard Mitigation Meetings and Work Sessions... 2 City of Creswell: Hazard Quantification... 3 City of Creswell: Mitigation Projects City of Creswell: Hazard Mitigation Plan Implementation and Maintenance Annex 3 - City of Dunes City... 1 Introduction: City of Dunes City... 1 City of Dunes City: Hazard Mitigation Meetings and Work Sessions... 2 City of Dunes City: Hazard Quantification... 3 City of Dunes City: Mitigation Projects City of Dunes City: Hazard Mitigation Plan Implementation and Maintenance Annex 4 - City of Florence... 1 Introduction: City of Florence... 1 City of Florence: Hazard Mitigation Meetings and Work Sessions... 2 City of Florence: Hazard Quantification... 3 City of Florence: Mitigation Projects City of Florence: Hazard Mitigation Plan Implementation and Maintenance Annex 5 - City of Oakridge... 1 Introduction: City of Oakridge... 1 City of Oakridge: Hazard Mitigation Meetings and Work Sessions... 2 City of Oakridge: Hazard Quantification... 3 City of Oakridge: Mitigation Projects City of Oakridge: Hazard Mitigation Plan Implementation and Maintenance Annex 6 - City of Veneta... 1 Introduction: City of Veneta Hazard Mitigation Reference... 1 City of Veneta: Hazard Mitigation Meetings and Work Sessions... 2 City of Veneta: Hazard Quantification Risk Assessment... 3 City of Veneta: Mitigation Projects LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page iv

7 City of Veneta: Hazard Mitigation Plan Implementation and Maintenance Annex 7 - City of Westfir... 1 Introduction: City of Westfir... 1 City of Westfir: Hazard Mitigation Meetings and Work Sessions... 2 City of Westfir: Hazard Quantification... 3 City of Westfir: Mitigation Project Details City of Westfir: Hazard Mitigation Plan Implementation and Maintenance LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page v

8 LIST OF FIGURES Figure 1-1 Oregon NHMP Natural Hazards Regions... 6 Figure 1-2 Incorporated and unincorporated areas of Lane County... 9 Figure 1-3 Developed Parcels of Lane County...13 Figure 1-4 Primary Physiographic Regions, Urban Growth Boundaries...15 Figure 1-5 Land Cover Types, Lane County Oregon...18 Figure 1-6 Coastal Cities, Lane County Oregon...24 Figure 1-7 Willamette Valley Cities, Lane County Oregon...25 Figure 1-8 South Willamette Valley Cities, Lane County Oregon...26 Figure 1-9 Eastern Cities, Lane County Oregon...27 Figure 2-1 Public Involvement Results, Responses by Location...41 Figure 3-1 Precipitation Baseline Average over 115 Years...61 Figure 3-2 US Drought Forecast...62 Figure 3-3 Drought Severity Index, August Figure 3-4 Degree of Expected Shaking and Earthquake Occurrences ( )...65 Figure 3-5 Cascadia Subduction Zone (CSZ)...66 Figure 3-6 Degree of Expected Shaking Cascadia Earthquake Event, Lane County...66 Figure 3-7 Earthquakes and Quaternary Faults...69 Figure 3-8 Peak Ground Acceleration: 2% Probability of Exceedance in 50 Years...70 Figure 3-9 DOGAMI IMS-24 Report, Liquifaction Susceptibility, Central-Western Oregon...72 Figure 3-10 Lane County Flood Hazard Areas...76 Figure 3-11 Western Lane County Flood Hazard Areas...77 Figure 3-12 Central Lane County Flood Hazard Areas...78 Figure 3-13 East Lane County Flood Hazard Areas...79 Figure 3-14 Annual Peak Flow, Willamette River at Albany Gauge, Figure 3-15 Comparative Extent, Historic Flood Events, Willamette River...89 Figure 3-16 Crude Oil Transport by Rail, Landslide Prone Areas: Lane County...93 Figure 3-17 Landslide Locations, Lane County Figure 3-18 Landslide Vulnerability Map, Lane County Oregon Figure 3-19 How Tsunamis Occur Figure 3-20 Cascadia Subduction Zone Setting Figure 3-21 Tsunami Inundation Map: Florence, Oregon Figure 3-22 Cascadia Subduction Zone Previous Occurrences Figure 3-23 Wildfire Locations, Lane County, circa Figure 3-24 Fire History: Middle Fork Willamette National Forest Figure 3-25 Tornado, Lane Community College, April 14, Figure 3-26 Peak Gusts, February 24, Figure 3-27 Peak Gusts, October 12, 1962 (Columbus Day Storm) Figure 3-28 National Weather Service Wind Chill Chart Figure 3-29 Lane County Winter Storm December 2015, Disaster Declaration Figure 3-30 Observed Precipitation, Month of December 2015, Lane County, Oregon Figure 3-31 Lane County Winter Storm February 2014, Disaster Declaration Figure 3-32 Volcanic Hazard, Western-Central Oregon (2015) Figure 3-33 Uplift in West Three Sisters Area Figure 3-34 Physiographic Regions of Lane County Figure 3-35 Excerpt from DOGAMI TIMs (Florence Old Town Area) Figure 3-36 Excerpt from DOGAMI TIMs (Northwest Florence, Heceta Beach Area) Figure 3-37 Full Map DOGAMI TIMs (Northwest Florence, Heceta Beach Area) Figure 3-38 Essential Facilities in Flood Zone Figure 3-39 Lane County Non-Essential Facilities in Relation to Mapped Flood Plains LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page vi

9 Figure 3-40 High Water Locations, Central Lane County Figure 3-41 High Water Locations, Western Lane County Figure 3-42 High Water Locations, Eastern Lane County Figure 3-43 Facilities in Relation to Wildland-Urban Interface Figure 3-44 Improvement Value per Parcel; Lane County (2014 Data) Figure 3-45 Improvement Value per Parcel (Cont d); Lane County (2014 Data) Figure 4-1 Lane County Rural Comprehensive Plan: Goal 7 Excerpt LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page vii

10 LIST OF TABLES Table I Federal Disaster Declaration History, Lane County... 7 Table II Other Declarations, State of Oregon ( )... 8 Table III U.S. Census Data for Lane County as of Table IV Assessed Value by Property Class, Lane County Table V Population Comparisons ( ) and Housing Unit Data (2012) Table VI Population Forecasts Table VII Public Involvement Results, Hazard Mitigation Goals Ranking Table VIII Public Involvement Results, Overall Hazard Significance Table IX Profiled Hazards for Lane County Table X Hazard Analysis Scoring (Quantification) Table XI Dams Located in Lane County Table XII Drought Monitor: Drought Severity Classification Table XIII Lane County Drought Impacts January 2013 June Table XIV Earthquake Magnitude / Intensity Comparison Table XV Major CSZ Earthquakes: 1180 BCE to Present Table XVI Flooding Events as Reported by NCDC, Lane County, Table XVII Siuslaw River Historical Crests at Mapleton Ranked by Gauge Height Table XVIII Willamette River Historical Crests near Harrisburg Ranked by Gauge Height Table XIX Mohawk River Historical Crests near Springfield Ranked by Gauge Height Table XX Geographic Area of Willamette Valley Inundated by Major Floods Table XXI Hazardous Materials Reports, National Response System, Lane County Table XXII Personal Experience with Wildland Fire, Lane County Residents Table XXIII Human Caused Fires: Number and Acreage by U.S. Region Table XXIV Appended Beaufort Wind Scale Table XXV Enhanced Fujita Scale Table XXVI Volcanic Event History Table XXVII Volcanoes in Proximity to Lane County Table XXVIII Vulnerability and Impact Categories per Hazard Type Table XXIX NFIP Repetitive Loss Data, Lane County (2015) Table XXX NFIP Flood Insurance Claim Data, Current as of December Table XXXI Policies, Total Premiums, Claims Made Under The NFIP Table XXXII NFIP Policies, Insurance in Force, per Jurisdiction Table XXXIII Population/Residential Structures per Physiographic Region Table XXXIV Estimated Social Impact, Crustal or CSZ Earthquake; HAZUS-MH Analysis Table XXXV Total Buildings in Mapped Area Table XXXVI Total Buildings within Tsunami Zones* Table XXXVII DOGAMI Rapid Visual Seismic Assessment, Very High and High Ratings Table XXXVIII Estimated Hospital Beds Before and After Cascadia Subduction Earthquake 161 LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page viii

11 ACRONYMS AND ABBREVIATIONS CFR Code of Federal Regulations COOP Continuity of Operations Plan CRS Community Rating System CSZ Cascadia Subduction Zone CWPP Community Wildfire Protection Plan DLCD Department of Land Conservation (Oregon) DOGAMI Department of Geology and Mineral Industries (Oregon) DRP Disaster Recovery Plan EF Enhanced Fujita EOP Emergency Operations Plan EQ Earthquake EWEB Eugene Water & Electric Board FEMA Federal Emergency Management Association FIRM Flood Insurance Rate Map FMA Flood Management Assistance GAO Government Accounting Office GIS Geographic Information Systems HazMat Hazardous Materials HM&EM-SC Hazard Mitigation & Emergency Management Steering Committee HMGP Hazard Mitigation Grant Program HMP Hazard Mitigation Plan HWY Highway IA Incident Annex IFC International Fire Code IMS Interpretive Map Series IMT2 Incident Management Team Type 2 KBDI Keetch-Byram Drought Index LC Lane County LCFDB Lane County Fire Defense Board LCRCP Lane County Rural Comprehensive Plan LMD Lane Management Division (Lane County) MGMT Management MMI Modified Mercalli Intensity MWERS McKenzie Watershed Emergency Response System NCDC National Climatic Data Center NFIP National Flood Insurance Program NHMP Natural Hazards Mitigation Plan NID National Inventory of Dams NOAA Nation Oceanic and Atmospheric Association NRC Natural Resources Conservation NRCS Natural Resources Conservation Service NRS National Response System NSSL National Severe Storms Laboratory LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page ix

12 NWS OEESC OEM OESC OFC OMDISC OMSC OPSC OR ORS ORSC OSSC PA PDM PDSI PGA PNW PSU PW RFC RFPD RLP SFHA SRGP SRL SUB UGB USACE USGS National Weather Service Oregon Energy Efficiency Specialty Code Oregon Emergency Management Oregon Electrical Specialty Code Oregon Fire Code Oregon Manufactured Dwelling Installation Specialty Code Oregon Mechanical Specialty Code Oregon Plumbing Specialty Code Oregon Oregon Revised Statute(s) Oregon Residential Specialty Code Oregon Structural Specialty Code Public Assistance Pre-Disaster Mitigation Palmer Drought Severity Index Peak Ground Acceleration Pacific Northwest Portland State University Public Works Repetitive Flood Claim Rural Fire Protection District Repetitive Loss Property Special Flood Hazard Area Seismic Resiliency Grant Program Severe Repetitive Loss Springfield Utility Board Urban Growth Boundary United States Army Corps of Engineers United States Geological Survey LANE COUNTY OREGON HAZARD MITIGATION ACTION PLAN Page x