PARK COUNTY Multi-Jurisdictional Multi-Hazard MITIGATION PLAN Heart Mountain, North of Cody, Park County, Wyoming Prepared by: Park County – Cody, Wyoming with assistance from Beck Consulting - Red Lodge, Montana May 2011 Park County Multi-Jurisdiction Multi-Hazard Mitigation Plan Table of Contents Executive Summary……………………………………………………..iv I. ........ Introduction ....................................................................................... 1-1 II. ....... Planning Process…………………………………………………………2-1 III. ...... Dam Failure ...................................................................................... 3-1 IV. ...... Drought ............................................................................................. 4-1 V. ....... Earthquake ....................................................................................... 5-1 VI. ...... Floods ............................................................................................... 6-1 VII. ..... Hail ................................................................................................... 7-1 VIII. .... Hazardous Materials……………………………………………………...8-1 IX. ...... Landslides ......................................................................................... 9-1 X. ....... Lightning ......................................................................................... 10-1 XI. ...... Snow Avalanches……………………………………………………….11-1 XII. ..... Tornadoes ....................................................................................... 12-1 XIII. .... Wildland Fires ................................................................................. 13-1 XIV. ... Winter Storms ................................................................................. 14-1 XV. .... Mitigation Strategy .......................................................................... 15-1 XVI. ... Monitoring, Maintenance, Revision, and Coordination .................... 16-1 Figures 1.1 Park County Map ................................................................................................. 1-1 3.1 Dams Inspected by the State Engineer’s Office and USBR ............................... 3-2 4.1 Wyoming Annual Precipitation (1985-2006) ........................................................ 4-3 5.1 Historic Earthquakes in Wyoming........................................................................ 5-1 5.2 500-Year Probabilistic Acceleration Map ............................................................ 5-6 5.3 1000-Year Probabilistic Acceleration Map .......................................................... 5-7 5.4 2500- Year Probabilistic Acceleration Map ......................................................... 5-8 5.5 Potential Liquefaction Areas………………………………………………………..5-10 6.1 Park County DFIRM and HAZUS Flood Hazards ............................................. 6-10 6.2 Park County HAZUS Flood Depth ..................................................................…6-11 6.3 Park County HAZUS Building Loss………………………………………………..6-12 6.4 City of Cody DFIRM Flood Hazards………………….……………………………6-13 6.5 City of Cody DFIRM HAZUS Flood Depth………………………………………..6-14 6.6 City of Cody HAZUS Building Loss………………………………………………..6-15 6.7 Town of Meeteetse DFIRM Flood Hazards……………………………………….6-16 6.8 Town of Meeteetse DFIRM HAZUS Flood Depth………………………………..6-17 6.9 Town of Meeteetse Building Loss……………………………………………….…6-18 7.1 Hail Damages by County ..................................................................................... 7-3 8.1 RMP Facilities in Wyoming………………………………………………………….8-4 9.1 Mapped Landslides in Wyoming.......................................................................... 9-1 9.2 Wyoming Landslide Classification ....................................................................... 9-2 9.3 Park County Landslide Map .............................................................................. 9-12 9.4 Wyoming Landslide Exposure by County ......................................................... 9-13 i 9.5 Landslide Exposure in Park County .................................................................. 9-14 10.1 Average Annual Lightning Flash Density .......................................................... 10-5 11.1 U.S. Fatalities by State………………………………………………………………11-2 11.2 Wyoming Avalanche Fatalities by Activity………………………………………..11-3 11.3 Wyoming Avalanche Fatalities by Location………………………………………11-3 12.1 Wyoming Tornadoes (1950-1995) ..................................................................... 12-3 12.2 Wyoming Tornado Damage Data….………………………………………………12-6 13.1 Extent of Burn, 1988 .......................................................................................... 13-3 13.2 Annual Precipitation and Acres Burned............................................................. 13-4 13.3 Wildland Fire Red Zones…………………………………………………………...13-9 13.4 Wildland Fire Building Exposure………………………………………………….13-10 Tables 1.1 Land Ownership in Park County……………………………………………………1-2 2.1 Local Planning Documents Consulted……………………………………………..2-4 4.1 Wyoming’s Recent Worst Multi-Year, Statewide Droughts ................................. 4-2 4.2 Peak Commodity Production Changes .............................................................. 4-4 4.3 Peak Commodity Production Changes…………………………………………….4-5 4.4 1999 Production………………………………………………………………………4-6 4.5 2000 Production………………………………………………………………………4-6 4.6 2001 Production………………………………………………………………………4-7 4.7 2002 Production………………………………………………………………………4-7 4.8 2003 Production………………………………………………………………………4-8 4.9 2004 Production………………………………………………………………………4-8 4.10 2005 Production………………………………………………………………………4-9 4.11 2006 Production………………………………………………………………………4-9 4.12 Production and Inventory Value Impact…………………………………………..4-10 5.1 Modified Mercalli Scale Intensity ......................................................................... 5-4 5.2 Potential Earthquake Losses ............................................................................ 5-12 5.3 County Impact Rated by Loss Ratio .................................................................. 5-13 5.4 County Impacts Rated by Dollar Loss .............................................................. .5-14 5.5 HAZUS-MH 2500-Year Probabilistic Earthquake Scenario Results…………...5-14 5.6 HAZUS-MH Transportation and Utility System Economic Losses……………..5-15 6.1 Park County Flood Data………………………………………………………………6-3 6.2 HAZUS Flood Loss Estimation by Municipality…………………………………..6-19 6.3 HAZUS Flood Loss Estimated Additional Analysis………………………………6-19 7.1 Damaging Hail Storms ......................................................................................... 7-2 8.1 Hazardous Materials………………………………………………………………….8-1 8.2 RMP Facilities in Park County………………………………………………………8-5 8.3 Hazardous Materials in Park County ................................................................... 8-5 9.1 Building Exposure Values for Landslides.. ........................................................ 9-15 10.1 Recorded Lightning Events................................................................................ 10-2 11.1 Wyoming Fatal Snow Avalanche Events…………………………………………11-4 12.1 Original Fujita Scale……..………………………………………………………….12-2 12.2 Enhanced Fujita Scale ……………………………………………………………..12-2 12.3 Wyoming Tornado Data Totals by County……..…………………………………12-3 12.4 Park County Damaging Tornado Events………………………………………….12-4 12.5 Tornado Damage by County……………………………………………………….12-5 12.6 Tornado Events by County…………………………………………………………12-7 ii 13.1 Recorded Wildfire Events………………………………………………………….13-5 13.2 Park County CWPP Final WUI Rating……………………………………………13-11 14.1 Park County Winter Storms………….……………………………………………..14-2 15.1 Project Types………………………………………………………………………...15-2 15.2 Goal One……….…………………………………………………………………….15-4 15.2 Goal Two…….……………………………………………………………………….15-6 15.3 Goal Three…….……………………………………………………………………..15-8 Appendices A. Planning Process Documentation ....................................................................... A-1 B. Citizen Survey Report .......................................................................................... B-1 C. Status of 2006 Projects ........................................................................................C -1 D. Critical Infrastructure and Facilities .....................................................................D -1 E. Risk Assessment by Jurisdiction ......................................................................... E-1 F. Acronyms Used in This Plan………………………………………………….……..F-1 G. Resolution of Adoption……………………………………………………………….G-1 iii EXECUTIVE SUMMARY Park County and the municipalities of Cody, Meeteetse, and Powell developed and adopted a Multi-Hazard Mitigation Plan in 2006. This plan revises and updates that original plan. This revision was prepared by the Park County Office of Homeland Security with the assistance of contractor, Beck Consulting. The content of the plan relies on the advice and guidance of the Local Emergency Planning Committee, elected officials, local government staff, a local planning team formed for this purpose, and members of the public. This revision was unusual because of the high level of direct involvement of the local jurisdictions’ elected officials. Information was available about the project through coverage by the Cody Enterprise, the Powell Tribune, and the Park County Office of Homeland Security. The draft plan was made available at city/town and county offices, the three public libraries, and online,