Shoshone County Multi-Jurisdictional Hazards
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Shoshone County Multi-Jurisdictional Hazards Mitigation Plan Shoshone County, with the Cities of Kellogg, Mullan, Osburn, Pinehurst, Smelterville, Wallace & Wardner August 31, 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 .........................................................................................2 1.3. Shoshone Board of County Commissioners Adoption ..................................................3 1.4. Kellogg City Council Adoption.......................................................................................4 1.5. Mullan City Council Adoption ........................................................................................5 1.6. Osburn City Council Adoption .......................................................................................6 1.7. Pinehurst City Council Adoption....................................................................................7 1.8. Smelterville City Council Adoption ................................................................................8 1.9. Wallace City Council Adoption ......................................................................................9 1.10. Wardner City Council Adoption ...................................................................................10 1.11. Representatives of Shoshone County Government....................................................11 1.12. Representatives of City Governments ........................................................................12 1.13. Structural Fire Protection Services Representatives...................................................13 1.14. Representatives of Federal and State Agencies, Communities and Companies........14 2. Planning Environment..........................................................................................................16 2.1. Development and Approval Process...........................................................................16 2.1.1. Mission Statement...............................................................................................16 2.1.2. Vision Statement .................................................................................................17 2.1.3. Goals ...................................................................................................................17 2.1.3.1. Objectives to Meet Goals ................................................................................17 2.2. FEMA Disaster Mitigation Planning.............................................................................18 2.3. Linkage to the Idaho State Mitigation Plan..................................................................19 2.4. Guidance and Integration with County Planning Activities..........................................19 2.5. Municipality Planning Guidance ..................................................................................20 2.6. Agency Planning Guidance.........................................................................................24 2.7. Organizational Planning Guidance..............................................................................25 2.8. Membership on Planning Committee Summary..........................................................25 2.9. Planning Process Summary........................................................................................27 2.10. Public Involvement Summary......................................................................................33 2.10.1. Press Releases ...................................................................................................42 2.10.1.1. Public Meetings Media Coverage....................................................................42 2.10.1.2. Public Review Period Announced ...................................................................43 2.10.2. Public Mail Survey...............................................................................................44 2.10.3. Public Review Process........................................................................................49 Shoshone County Multi-Jurisdictional Hazards Mitigation Plan: August 31, 2009 - i - 3. Shoshone County and Local Municipalities .........................................................................51 3.1. Demographics .............................................................................................................51 3.2. Population Density and Development .........................................................................52 3.3. Resource Economics ..................................................................................................53 3.4. Land Areas and Cover ................................................................................................54 3.5. Land Ownership ..........................................................................................................56 3.6. Climatic Conditions .....................................................................................................56 3.6.1. Kellogg ................................................................................................................57 3.6.2. Wallace – Woodland Park ...................................................................................57 3.6.3. Mullan..................................................................................................................57 3.6.4. Avery ...................................................................................................................58 3.6.5. Clarkia .................................................................................................................58 3.7. USGS Annual Peak Streamflow..................................................................................58 3.7.1. Main Fork Coeur d’Alene River System ..............................................................59 3.7.2. South Fork Coeur d’Alene River System.............................................................59 3.7.3. St. Joe River System...........................................................................................61 3.8. Municipal Water Supply Systems in Shoshone County ..............................................62 3.9. Summary of Superfund Status in the Silver Valley .....................................................64 3.9.1. CERCLA Remedies in the Context of Flooding...................................................65 3.9.2. Flooding and Drainage Under CERCLA Actions.................................................66 3.9.3. Municipal Drainage and Flood Control ................................................................66 3.9.4. Milo Creek Flooding in May 1997........................................................................67 3.9.5. Sediment Deposition in Spring 2008 ...................................................................67 3.9.6. Contaminant Management Rule..........................................................................69 3.10. Valuation of Real Property ..........................................................................................69 3.10.1. Private Property...................................................................................................70 3.10.2. Public Buildings ...................................................................................................72 3.10.3. Other Improvement Values .................................................................................74 4. Shoshone County Natural Hazard Assessments.................................................................77 4.1. Phase I Hazard Profile ................................................................................................86 4.2. Flood ...........................................................................................................................87 4.2.1. Weather...............................................................................................................89 4.2.2. Topography and Geographic Influences .............................................................90 4.2.2.1. Understanding Stream Order as an Analysis Tool ..........................................90 4.2.3. History .................................................................................................................91 4.2.4. Development .......................................................................................................93 Shoshone County Multi-Jurisdictional Hazards Mitigation Plan: August 31, 2009 - ii - 4.2.5. Shoshone County Flood Profile...........................................................................93 4.2.6. Resources at Risk ...............................................................................................94 4.2.6.1. Private Property Improvement Values.............................................................94 4.2.6.2. Government Resource Improvement Values ..................................................96 4.2.6.3. Replacement Cost of Superfund Site Remediation .........................................98