Shoshone County Multi-Jurisdictional Hazards Mitigation Plan Shoshone County, with the Cities of Kellogg, Mullan, Osburn, Pinehurst, Smelterville, Wallace & Wardner August 24, 2009 City of Smelterville Elevation 2,234 ft This effort developed with the Shoshone County Multi-Jurisdictional Hazards Mitigation Planning Committee and environmental and regional planning services provided by: TerraGraphics Environmental Engineering, Inc. 108 West Idaho Ave. Kellogg, Idaho 83837 Table of Contents 1. Adoptions, Promulgations, and Acceptance ..........................................................................1 1.1. FEMA Region X Letter of Approval ...............................................................................1 1.2. Authorship and Conveyance .........................................................................................1 1.3. Shoshone Board of County Commissioners Adoption ..................................................2 1.4. Kellogg City Council Adoption.......................................................................................3 1.5. Mullan City Council Adoption ........................................................................................4 1.6. Osburn City Council Adoption .......................................................................................5 1.7. Pinehurst City Council Adoption....................................................................................6 1.8. Smelterville City Council Adoption ................................................................................7 1.9. Wallace City Council Adoption ......................................................................................8 1.10. Wardner City Council Adoption .....................................................................................9 1.11. Representatives of Shoshone County Government....................................................10 1.12. Representatives of City Governments ........................................................................11 1.13. Structural Fire Protection Services Representatives...................................................12 1.14. Representatives of Federal and State Agencies, Communities and Companies........13 2. Planning Environment..........................................................................................................15 2.1. Development and Approval Process...........................................................................15 2.1.1. Mission Statement...............................................................................................15 2.1.2. Vision Statement .................................................................................................16 2.1.3. Goals ...................................................................................................................16 2.1.3.1. Objectives to Meet Goals ................................................................................16 2.2. FEMA Disaster Mitigation Planning.............................................................................17 2.3. Linkage to the Idaho State Mitigation Plan..................................................................18 2.4. Guidance and Integration with County Planning Activities..........................................18 2.5. Municipality Planning Guidance ..................................................................................19 2.6. Agency Planning Guidance.........................................................................................23 2.7. Organizational Planning Guidance..............................................................................24 2.8. Membership on Planning Committee Summary..........................................................24 2.9. Planning Process Summary........................................................................................26 2.10. Public Involvement Summary......................................................................................32 2.10.1. Press Releases ...................................................................................................41 2.10.1.1. Public Meetings Media Coverage....................................................................41 2.10.1.2. Public Review Period Announced ...................................................................42 2.10.2. Public Mail Survey...............................................................................................43 2.10.3. Public Review Process........................................................................................48 Shoshone County Multi-Jurisdictional Hazards Mitigation Plan: August 24, 2009 - i - 3. Shoshone County and Local Municipalities .........................................................................50 3.1. Demographics .............................................................................................................50 3.2. Population Density and Development .........................................................................51 3.3. Resource Economics ..................................................................................................52 3.4. Land Areas and Cover ................................................................................................53 3.5. Land Ownership ..........................................................................................................55 3.6. Climatic Conditions .....................................................................................................55 3.6.1. Kellogg ................................................................................................................56 3.6.2. Wallace – Woodland Park ...................................................................................56 3.6.3. Mullan..................................................................................................................56 3.6.4. Avery ...................................................................................................................57 3.6.5. Clarkia .................................................................................................................57 3.7. USGS Annual Peak Streamflow..................................................................................57 3.7.1. Main Fork Coeur d’Alene River System ..............................................................58 3.7.2. South Fork Coeur d’Alene River System.............................................................58 3.7.3. St. Joe River System...........................................................................................60 3.8. Municipal Water Supply Systems in Shoshone County ..............................................61 3.9. Summary of Superfund Status in the Silver Valley .....................................................63 3.9.1. CERCLA Remedies in the Context of Flooding...................................................64 3.9.2. Flooding and Drainage Under CERCLA Actions.................................................65 3.9.3. Municipal Drainage and Flood Control ................................................................65 3.9.4. Milo Creek Flooding in May 1997........................................................................66 3.9.5. Sediment Deposition in Spring 2008 ...................................................................66 3.9.6. Contaminant Management Rule..........................................................................68 3.10. Valuation of Real Property ..........................................................................................68 3.10.1. Private Property...................................................................................................69 3.10.2. Public Buildings ...................................................................................................71 3.10.3. Other Improvement Values .................................................................................73 4. Shoshone County Natural Hazard Assessments.................................................................76 4.1. Phase I Hazard Profile ................................................................................................85 4.2. Flood ...........................................................................................................................86 4.2.1. Weather...............................................................................................................88 4.2.2. Topography and Geographic Influences .............................................................89 4.2.2.1. Understanding Stream Order as an Analysis Tool ..........................................89 4.2.3. History .................................................................................................................90 4.2.4. Development .......................................................................................................92 Shoshone County Multi-Jurisdictional Hazards Mitigation Plan: August 24, 2009 - ii - 4.2.5. Shoshone County Flood Profile...........................................................................92 4.2.6. Resources at Risk ...............................................................................................93 4.2.6.1. Private Property Improvement Values.............................................................93 4.2.6.2. Government Resource Improvement Values ..................................................95 4.2.6.3. Replacement Cost of Superfund Site Remediation .........................................97