Boone County Hazard Mitigation Plan 2015 Cover Illustrations (surrounding outline map of Boone County and its jurisdictions, counterclockwise from upper left): Outdoor Warning Siren Activation Zone Map (p. 77), DFIRM Flood Zones, Boone County, MO (p. 141) USACE National Levee Database map for Hartsburg area (p. 171), Concentrated Sinkholes and Potential Collapse Areas (southern Boone Co., p. 228) Highest Projected Modified Mercalli Intensities by County (p. 216) The planning process for the update of the Boone County Hazard Mitigation Plan was led by the Mid-Missouri Regional Plan Commission through a contractual agreement with the MO State Emergency Management Agency and Boone County. Mid-Missouri Regional Planning Commission 206 East Broadway, P.O. Box 140 Ashland, MO 65010 Phone: (573) 657-9779 Fax: (573) 657-2829 Table of Contents Executive Summary ........................................................................................................................ 1 Plan Adoption ................................................................................................................................. 7 Log of Post-Adoption Changes to Plan ........................................................................................ 27 List of Major Acronyms Used in Plan .......................................................................................... 29 Section 1: Introduction and Planning Process .............................................................................. 31 1.1 Purpose .............................................................................................................................. 31 1.2 Background ....................................................................................................................... 32 1.3 History of the Boone County Hazard Mitigation Plan...................................................... 32 1.4 Participating Jurisdictions ................................................................................................. 34 1.5 The Update Process........................................................................................................... 35 Section 2: Planning Area Overview .............................................................................................. 45 2.1 Geography, Geology and Ecology ...................................................................................... 45 2.2 Climate ................................................................................................................................ 50 2.3 History................................................................................................................................. 51 2.4 Hazard History .................................................................................................................... 51 2.5 Population, Housing and Poverty ....................................................................................... 54 2.6 Education ............................................................................................................................ 59 2.7 Employment and Income .................................................................................................... 60 2.8 Transportation and Commuting Patterns ............................................................................ 63 Section 3: Planning Area Assets and Capabilities ........................................................................ 67 3.1 Critical Facilities Overview ............................................................................................... 67 Government........................................................................................................................... 68 Fire Protection ....................................................................................................................... 69 Public Water Supply Districts ............................................................................................... 71 Wastewater Facilities ............................................................................................................ 72 Medical Facilities .................................................................................................................. 73 Office of Emergency Management ....................................................................................... 75 3.2 County and Communities .................................................................................................. 86 Boone County ....................................................................................................................... 86 Ashland ................................................................................................................................. 90 Centralia ................................................................................................................................ 93 Columbia ............................................................................................................................... 96 Hallsville ............................................................................................................................. 101 Harrisburg ........................................................................................................................... 103 Hartsburg............................................................................................................................. 105 Huntsdale ............................................................................................................................ 107 Rocheport ............................................................................................................................ 109 Sturgeon .............................................................................................................................. 111 3.3 School Districts and Higher Education ............................................................................ 113 Centralia R-VI School District............................................................................................ 113 Columbia Public Schools .................................................................................................... 114 Hallsville R-IV School District ........................................................................................... 116 Harrisburg R-VIII School District ...................................................................................... 117 Southern Boone County R-I School District ...................................................................... 118 Sturgeon R-V School District ............................................................................................. 119 Columbia College ............................................................................................................... 120 Stephens College ................................................................................................................. 121 University of Missouri ........................................................................................................ 122 3.4 Other Special Districts and Organizations ....................................................................... 123 Road and Bridge Districts ................................................................................................... 123 Non-Governmental and Volunteer Organizations .............................................................. 123 3.5 Policy, Planning, and Program Capabilities .................................................................... 124 Legal Authority ................................................................................................................... 124 Community and Regional Partnerships .............................................................................. 125 Political Willpower ............................................................................................................. 125 Plans and Regulations ......................................................................................................... 126 Section 4: Risk Assessment ........................................................................................................ 129 The Effects of Climate Change on Hazards ............................................................................ 134 Natural Hazards Affecting the Planning Area ........................................................................ 138 4.1 Flood ................................................................................................................................. 139 4.2 Levee Failure .................................................................................................................... 167 4.3 Dam Failure ...................................................................................................................... 184 4.4 Earthquake ........................................................................................................................ 215 4.5 Land Subsidence/Sinkholes .............................................................................................. 225 4.6 Severe Thunderstorms (including Damaging Winds, Hail, and Lightning) ..................... 233 4.7 Tornado ............................................................................................................................. 243 4.8 Severe Winter Weather (including Ice, Snow,