DRAFT Hazard Mitigation Plan Ozaukee County, Wisconsin Original Plan Date - 2008 EPTEC, INC Lenora Borchardt 1535 Ivory Drive Sun Prairie, WI 53590-1820 608-834-0802 [email protected] Contents Table of Contents Table of Contents ............................................................................................................ 3 Introduction and Background .......................................................................................... 6 Previous Planning Efforts and Legal Basis ..........................................................................7 Plan Preparation, Adoption and Maintenance ...................................................................10 Physical Characteristics of Ozaukee County ................................................................. 16 General Community Introduction ......................................................................................16 Plan Area ............................................................................................................................18 Geology ..............................................................................................................................19 Topography ........................................................................................................................20 Climate ...............................................................................................................................22 Hydrology ..........................................................................................................................24 Soil Types ..........................................................................................................................25 Wetlands ............................................................................................................................26 Vegetation ..........................................................................................................................28 Demographics ............................................................................................................... 29 Human Settlement Patterns ................................................................................................29 Population ..........................................................................................................................30 Transportation Network .....................................................................................................32 Public Safety Support ........................................................................................................32 Archaeological and Historical Resources ..........................................................................38 Hazard Analysis ............................................................................................................ 41 All Hazards .................................................................................................................... 43 Vulnerability ......................................................................................................................43 Hazard Mitigation Strategies .............................................................................................43 Coastal Erosion ............................................................................................................. 48 Physical Characteristics .....................................................................................................48 Frequency of Occurrence ...................................................................................................50 Vulnerability ......................................................................................................................51 Hazard Mitigation Strategies .............................................................................................52 Drought and Dust Storms .............................................................................................. 53 Physical Characteristics .....................................................................................................53 Frequency of Occurrence ...................................................................................................55 Vulnerability ......................................................................................................................56 Hazard Mitigation Strategies .............................................................................................57 Earthquakes .................................................................................................................. 58 Physical Characteristics .....................................................................................................58 Frequency of Occurrence ...................................................................................................60 Vulnerability ......................................................................................................................62 Hazard Mitigation Strategies .............................................................................................63 Flooding and Dam Failure ............................................................................................. 65 Physical Characteristics .....................................................................................................65 Watersheds .........................................................................................................................68 Floodplain Regulations ......................................................................................................70 Page 3 Contents Frequency of Occurrence ...................................................................................................71 Vulnerability ......................................................................................................................78 Hazard Mitigation Strategies .............................................................................................81 Fog ................................................................................................................................ 86 Physical Characteristics .....................................................................................................86 Frequency of Occurrence ...................................................................................................88 Vulnerability ......................................................................................................................91 Hazard Mitigation Strategies .............................................................................................94 Forest and Wildfires ...................................................................................................... 97 Physical Characteristics .....................................................................................................97 Frequency of Occurrence ...................................................................................................98 Vulnerability ......................................................................................................................98 Hazard Mitigation Strategies .............................................................................................98 Landslide ..................................................................................................................... 100 Physical Characteristics ...................................................................................................100 Frequency of Occurrence .................................................................................................102 Vulnerability ....................................................................................................................103 Hazard Mitigation Strategies ...........................................................................................104 Severe Temperatures .................................................................................................. 106 Characteristics ..................................................................................................................106 Physical Characteristics: Heat..........................................................................................106 Physical Characteristics: Cold .........................................................................................107 Frequency of Occurrence .................................................................................................108 Vulnerability ....................................................................................................................110 Hazard Mitigation Strategies ...........................................................................................110 Storms: Hail ................................................................................................................. 111 Physical Characteristics ...................................................................................................111 Frequency of Occurrence .................................................................................................112 Vulnerability ....................................................................................................................113 Hazard Mitigation Strategies ...........................................................................................114