Winona County Hazard Mitigation Plan Update Adoption Date: -- ______2012 1 Primary Point of Contact Jill Johnson Coordinator of Special Projects Winona County Administration Department 177 Main Street Winona, MN 55987 Office: 507.457.6552 E-mail: [email protected] Secondary Point of Contact Anne Morse Winona County Planning and Environmental Services 177 Main Street Winona, MN 55987 Office 507.457.6468 Fax 507.457.6465 Cell 507.313.3171 E-mail: [email protected] Thanks to Laura Lake, a public administration major at Winona State University, who assisted in writing this plan and Clara Dux, who aided in formatting. Winona County All Hazard Mitigation Plan August 13, 2013 2 Table of Contents Section 1 - Public Planning Process ................................................................................. 6 1.1 Introduction ............................................................................................................................ 6 1.2 Planning Authority and Guidance .......................................................................................... 6 1.3 Disaster Declarations .............................................................................................................. 7 1.4 Planning Scope ....................................................................................................................... 7 1.5 Planning Process Summary .................................................................................................... 7 1.6 Planning Team Information .................................................................................................... 8 1.7 Public Involvement in Planning Process .............................................................................. 10 1.8 Review of Technical Resources ............................................................................................ 10 1.9 Review of Existing Plans ...................................................................................................... 10 Section 2 - Jurisdiction Participation Information ...................................................... 12 2.1 Adoption by Local Governing Body .................................................................................... 12 2.2 Jurisdiction Participation ...................................................................................................... 12 Section 3 - Jurisdiction Information .............................................................................. 14 3.1 Topography & Geology ............................................................................................................. 14 3.2 Soils ........................................................................................................................................... 16 3.3 Land Cover ................................................................................................................................ 17 3.4. Hydrology ................................................................................................................................. 18 3.4.1 Major Lakes, Rivers, and Watersheds...................................................................................... 18 3.4.2 Wetlands .................................................................................................................................. 21 3.5 Climate ....................................................................................................................................... 22 3.6 Demographics ............................................................................................................................ 24 3.7 Economy .................................................................................................................................... 26 3.8 Industry ...................................................................................................................................... 26 3.9 Land Use and Development Trends ........................................................................................... 27 Section 4 - Risk Assessment ............................................................................................ 30 4.1 Hazard Identification/Profile ..................................................................................................... 31 4.1.1 Existing Plans ............................................................................................................................. 31 4.1.2 Major Hazard Summary ............................................................................................................. 31 4.1.3 Hazard Ranking Methodology ................................................................................................... 31 4.1.4 County Hazard Rankings ........................................................................................................... 33 4.1.5 GIS and Hazus-MH ................................................................................................................... 33 4.2 Vulnerability Assessment .......................................................................................................... 34 4.2.1 Asset Inventory .......................................................................................................................... 34 Winona County All Hazard Mitigation Plan August 13, 2013 3 4.2.1.1 Essential Facilities List ....................................................................................................... 34 4.2.1.2 Facility Replacement Costs ................................................................................................. 35 4.3 Future Development .................................................................................................................. 36 4.4 Hazard Profiles .......................................................................................................................... 36 4.4.1 Tornado Hazard.......................................................................................................................... 36 4.4.2 Flood Hazard .............................................................................................................................. 40 4.4.3 Landslide Hazard ....................................................................................................................... 56 4.4.4 Drought Hazard .......................................................................................................................... 59 4.4.5 Earthquake Hazard ..................................................................................................................... 64 4.4.6 Thunderstorm Hazard ................................................................................................................ 65 4.4.7 Winter Storm Hazard ................................................................................................................. 68 4.4.8 Hazardous Materials Storage and Transport Hazard.................................................................. 71 4.4.9 Fire Hazard (Wildfires and Structural) ...................................................................................... 73 4.4.9.1 Wildfires ............................................................................................................................. 74 4.4.9.2 Structural Fire Hazard ......................................................................................................... 79 4.4.10 Sinkholes and Subsidence (Karst) Hazard ............................................................................... 81 4.4.11 Human-caused Hazard ............................................................................................................. 86 4.4.11.1 Terrorism ........................................................................................................................... 86 4.4.11.2 Infectious Disease Outbreak ............................................................................................. 87 Section 5 - Mitigation Strategy ....................................................................................... 91 5.1 Community Capability Assessment ........................................................................................... 91 5.1.1 National Flood Insurance Program (NFIP) ................................................................................ 92 5.1.2 Plans and Ordinances ................................................................................................................. 92 5.1.3 Fire Insurance Rating ................................................................................................................. 95 5.2 Mitigation Goals ........................................................................................................................ 95 5.3 Mitigation Action Analysis ........................................................................................................ 97 5.4 Implementation Strategy ........................................................................................................... 97 5.5 Multi-Jurisdictional Mitigation Strategy ................................................................................. 103 Section 6 - Plan Maintenance ....................................................................................... 104 6.1 Monitoring, Evaluating, and Updating the Plan ...................................................................... 104 6.2 Implementation