Carroll County
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VtÜÜÉÄÄ VÉâÇàç MULTI-JURISDICTIONAL NATURAL HAZARDS MITIGATION PLAN PARTICIPANTS Carroll County Mount Carroll, City of Chadwick, Village of Savanna, City of Eastland CUSD #308 Shannon, Village of Lanark, City of Thomson, Village of Milledgeville, Village of Thomson Fire Protection District Milledgeville Park District West Carroll CUSD #314 JANUARY 2013 The five year update of this Plan must be completed on or before April 18, 2018. Carroll County Multi-Jurisdictional Natural Hazards Mitigation Plan ACKNOWLEDGEMENTS Preparing a planning document of this size and scope takes a considerable amount of effort and time. Unlike some other kinds of planning efforts, this is the first time that Carroll County and the participating municipalities and townships had prepared a Natural Hazards Mitigation Plan. This Plan should be a useful resource for current and future residents who are interested in the impacts caused by severe weather in Carroll County. Information from various government sources has been supplemented by photographs and weather data from personal collections. The Carroll County Multi-Jurisdictional Natural Hazards Mitigation Planning Committee included residents who live throughout the County. Their knowledge of the devastation caused by severe weather coupled with their commitment to protecting the lives, property, and welfare of Carroll County residents resulted in this Plan. Leroy Getz is a crop and weather reporter who lives on his farm located between Mount Carroll and Savanna. He began recording rainfall totals approximately 30 years ago and his interest expanded to include gathering information about other types of weather events for the Carroll County Farm Bureau. Leroy is a fourth generation dairy farmer whose children help him maintain their Centennial Farm. His generous contribution of photographs and weather information, much of which is not available from any other source, greatly enriches the value and readability of this document. Sally Marken, Carroll County Public Health Department, and Janet Hockman, Carroll County Highway Department, both serve on the Local Emergency Planning Committee in addition to serving on the Committee that prepared this Plan. Through their diligence, photographs showing storm damages to important infrastructure illustrate the destructive power of natural hazards. Larry Stebbins, Mayor of Savanna, was able to provide detailed information and photographs of several historic flood events in Savanna. This information helped provide perspective on the magnitude of the flooding that has occurred repeatedly in and around Savanna. Larry Acker and his family have kept the only source of continuous weather records in Polo, Illinois since 1883. Larry’s great grandfather, William Edwin Acker, started keeping records when the Acker Brothers began farming in Polo. Larry lives on this Centennial farm from where weather information is supplied to the National Weather Service. Before him, Larry’s mother, Helen Johnston Acker, assisted in keeping weather records. The Acker site is the oldest continuous weather data site in Illinois that has not been moved to a different location. Carroll County Multi-Jurisdictional Natural Hazards Mitigation Plan CARROLL COUNTY MULTI-JURISDICTIONAL NATURAL HAZARDS MITIGATION PLAN CARROLL COUNTY, ILLINOIS TABLE OF CONTENTS 1.0 INTRODUCTION 1.1 PARTICIPATING JURISDICTIONS ................................................................................ 1-2 1.2 DEMOGRAPHICS ....................................................................................................... 1-2 1.3 LAND USE AND DEVELOPMENT TRENDS .................................................................. 1-4 2.0 PLANNING PROCESS 2.1 PLANNING COMMITTEE ............................................................................................ 2-2 2.2 PUBLIC INVOLVEMENT ............................................................................................. 2-5 2.3 PARTICIPATION OPPORTUNITIES FOR INTERESTED PARTIES ..................................... 2-7 2.4 INCORPORATING EXISTING PLANNING DOCUMENTS ................................................ 2-9 3.0 RISK ASSESSMENT 3.1 SEVERE STORMS (THUNDERSTORMS, HAIL, LIGHTNING & HEAVY RAIN) ................ 3-2 3.2 SEVERE WINTER STORMS (SNOW, ICE & EXTREME COLD) .................................... 3-34 3.3 FLOODS .................................................................................................................. 3-57 3.4 TORNADOES ........................................................................................................... 3-90 3.5 DROUGHT ............................................................................................................. 3-109 3.6 EXTREME HEAT .................................................................................................... 3-117 3.7 EARTHQUAKES ..................................................................................................... 3-123 3.8 DAMS ................................................................................................................... 3-134 4.0 MITIGATION STRATEGY 4.1 HAZARD MITIGATION GOALS ................................................................................... 4-1 4.2 IDENTIFYING, ANALYZING & PRIORITIZING MITIGATION ACTIONS .......................... 4-2 4.2.1 Identification and Analysis ....................................................................... 4-2 4.2.2 Prioritization .............................................................................................. 4-3 4.3 IMPLEMENTING MITIGATION ACTIONS ..................................................................... 4-4 4.4 MITIGATION STRATEGY RESULTS ............................................................................ 4-4 5.0 RECOMMENDATIONS ................................................................................................. 5-1 January 2013 Table of Contents i Carroll County Multi-Jurisdictional Natural Hazards Mitigation Plan 6.0 PLAN MAINTENANCE 6.1 MONITORING, EVALUATING & UPDATING THE PLAN ............................................... 6-1 6.1.1 Monitoring and Evaluating the Plan ......................................................... 6-1 6.1.2 Updating the Plan ...................................................................................... 6-2 6.2 INCORPORATING THE MITIGATION STRATEGY INTO EXISTING ................................. 6-2 PLANNING MECHANISMS 6.3 CONTINUED PUBLIC INVOLVEMENT ......................................................................... 6-3 7.0 PLAN ADOPTION 7.1 PLAN ADOPTION PROCESS ........................................................................................ 7-1 8.0 REFERENCES ....................................................................................................................... 8-1 APPENDICES County Resolution Authorizing the Development of the Plan ..................................... APPENDIX A Planning Committee Meeting Attendance Sheets .......................................................... APPENDIX B Planning Committee Meeting Minutes .......................................................................... APPENDIX C Citizen Questionnaire.................................................................................................... APPENDIX D Frequently Asked Questions Fact Sheet ........................................................................ APPENDIX E Newspapers Serving Carroll County and News Articles .............................................. APPENDIX F Public Forum – Planning Process Handout .................................................................. APPENDIX G Public Forum – Plan Comment Sheet ........................................................................... APPENDIX H Business Community Participation Packet ..................................................................... APPENDIX I Hazard Mitigation Planning Letter Sent to Adjacent Counties ...................................... APPENDIX J Floodplain Maps for NFIP-Participating Municipalities .............................................. APPENDIX K Historic Flood Photographs ........................................................................................... APPENDIX L Plan Adoption Resolutions ........................................................................................... APPENDIX M LIST OF FIGURES Figure 1 Federal Disaster Declarations for Carroll County .................................................... 1-1 Figure 2 Jurisdictions Represented in the Plan ....................................................................... 1-2 Figure 3 Location Map ............................................................................................................ 1-3 Figure 4 Demographic Data by Participating Jurisdiction ...................................................... 1-4 Figure 5 Description of Planning Process ............................................................................... 2-1 Figure 6 Carroll County Multi-Jurisdictional Natural Hazards Mitigation Planning ............. 2-3 Committee Member Attendance Record Figure 7 Existing Planning Documents by Participating Jurisdiction .................................... 2-9 Figure 8 Wind Speed Conversions .......................................................................................... 3-3 Figure 9 Hail Size Descriptions .............................................................................................. 3-4 Figure 10 TORRO Hailstorm Intensity