2019_KittitasCountyHMP_Volume 1_For Adoption

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TABLE OF CONTENTS viii LIST OF FIGURES No. Title Page No. Figure 2-1. Discussion Following the November 8th, 2018 Meeting in Ellensburg ................................... 2-7 Figure 2-2. Page 1 of Online Public Survey .............................................................................................. 2-8 Figure 2-3. Kittitas County Public Works Home Page, with Link to Hazard Mitigation Planning Update Page ............................................................................................................................................................ 2-8 Figure 2-4. Press Release for the Hazard Mitigation Planning Update, with Link to Public Survey ........ 2-9 Figure 2-5. January 9, 2019 Public Meeting Attendees ........................................................................... 2-10 Figure 2-6. Kittitas County Press Release, December 19, 2018 .............................................................. 2-11 Figure 2-7. City of Ellensburg Website Press Release ............................................................................ 2-12 Figure 2-8. Kittitas County Hazard Mitigation Plan website, with Links to Draft Plan .......................... 2-13 Figure 4-1. Main Features of Kittitas County ............................................................................................ 4-1 Figure 4-2. USDA Soil Map of Kittitas County ........................................................................................ 4-4 Figure 4-3. Kittitas County Critical Facilities .......................................................................................... 4-11 Figure 4-4. Annual % Change in Total Population in Kittitas County and Washington State ................ 4-13 Figure 4-5. Kittitas County Population and Projected Growth ................................................................ 4-15 Figure 4-6. Kittitas County Average Annual Rate of Population Growth ............................................... 4-15 Figure 4-7. Kittitas County Age Distribution, 2010 ................................................................................ 4-17 Figure 4-8. Planning Area Race Distribution ........................................................................................... 4-17 Figure 4-9. Occupations in Kittitas County ............................................................................................. 4-19 Figure 7-1. Areas Vulnerable to Avalanche ............................................................................................... 7-4 Figure 7-2. United States Avalanche Danger Scale ................................................................................... 7-9 Figure 8-1. Historical Causes of Dam Failure ........................................................................................... 8-2 Figure 8-2. Cle Elum Dam Inundation Area .............................................................................................. 8-6 Figure 8-3. Easton Dam Inundation Area .................................................................................................. 8-7 Figure 8-4. Keechelus and Kachess Dam Inundation Area ....................................................................... 8-8 Figure 9-1. Palmer Z-Index for July 2018 ................................................................................................. 9-3 Figure 9-2. Palmer Drought Severity Index for July 2018 ......................................................................... 9-4 Figure 9-3. Palmer Modified Drought Index for July 2018 ....................................................................... 9-4 Figure 9-4. Palmer Hydrological Drought Index for July 2018 ................................................................. 9-5 Figure 10-1. Earthquake Types in the Pacific Northwest ........................................................................ 10-2 Figure 10-2. Peak Ground Acceleration, Cle Elum Earthquake Scenario ............................................... 10-9 Figure 10-3. Peak Ground Acceleration, Horse Heaven Hills Earthquake Scenario ............................. 10-10 Figure 10-4. Peak Ground Acceleration, Mill Creek Earthquake Scenario ........................................... 10-11 Figure 10-5. Peak Ground Acceleration, Rattlesnake Wallula Earthquake Scenario ............................ 10-12 Figure 10-6. Peak Ground Acceleration, Saddle Mountain Earthquake Scenario ................................. 10-13 Figure 10-7. NEHRP Seismic Soil Site Classes for Kittitas County ..................................................... 10-14 Figure 10-8. Liquefaction Susceptibility for Kittitas County ................................................................ 10-15 Figure 10-9. PGA with 2-Percent Probability of Exceedance in 50 Years, Northwest Region ............. 10-17 Figure 11-1. CRS Communities by Class Nationwide as of May 1, 2018 ............................................... 11-4 Figure 11-2. Home in West Ellensburg Surrounded by Floodwaters, January 18, 2011 ......................... 11-8 Figure 11-3. Kittitas County Special Flood Hazard Areas ...................................................................... 11-9 Figure 11-4. Yakima River Hydrograph at Umtanum (USGS Station 12484500) ................................ 11-11 Figure 11-5. Historic Flood Insurance Claims by Census Block, 1978 to 2018 .................................... 11-20 Figure 11-6. Repetitive Loss Properties in Kittitas County, Aggregated by Census Block................... 11-21 Figure 12-1. Deep Seated Slide................................................................................................................ 12-2 Figure 12-2. Shallow Colluvial Slide ....................................................................................................... 12-2 Figure 12-3. Bench Slide ......................................................................................................................... 12-2 Figure 12-4. Large Slide .......................................................................................................................... 12-2 Figure 12-5. Kittitas County Landslide Hazard Areas ............................................................................. 12-4