Snohomish County 2020 Hazard Mitigation Plan Volume II September 2020 Prepared for: 3000 Rockefeller Avenue Everett, WA 98201 Prepared by: Ecology & Environment, Inc. 333 SW Fifth Ave, Suite 608 Portland, OR 97204 View the Snohomish County Hazard Mitigation Plan online at: https://snohomishcountywa.gov/2429/Hazard-Mitigation-Plan SNOHOMISH COUNTY HAZARD MITIGATION PLAN, VOLUME 2 | 2020 UPDATE TABLE OF CONTENTS Contents 1 Planning Partner Participation ........................................................... 1 1.1 Background ................................................................................................................................... 1 1.2 The Planning Partnership .............................................................................................................. 1 1.2.1 Initial Solicitation and Letters of Intent ................................................................................ 1 1.2.2 Planning Partner Expectations .............................................................................................. 2 1.3 Annex Preparation ........................................................................................................................ 4 1.3.1 Templates .............................................................................................................................. 4 1.3.2 Workshops ............................................................................................................................ 4 1.3.3 Hazard Probability, Exposure, and Vulnerability .................................................................. 4 1.3.4 Mitigation Action Prioritization............................................................................................. 5 1.3.5 Benefit-Cost Analysis............................................................................................................. 6 2 Unincorporated Snohomish County .................................................. 7 2.1 Hazard Mitigation Plan Points of Contact ..................................................................................... 7 2.2 Jurisdiction Profile ......................................................................................................................... 7 2.2.1 Population and Employment ................................................................................................ 7 2.2.2 Development and Trends ...................................................................................................... 7 2.2.3 Geography and Climate ........................................................................................................ 8 2.2.4 Governance ........................................................................................................................... 8 2.3 Risk Assessment ............................................................................................................................ 9 2.3.1 Jurisdiction-specific Hazard Event History ............................................................................ 9 2.3.2 Jurisdiction-specific Hazard Probability, Exposure and Vulnerability ................................. 10 2.3.3 Critical Infrastructure Risk Assessment ............................................................................... 13 2.4 Capabilities Assessment .............................................................................................................. 15 2.4.1 Planning and Regulatory Capabilities.................................................................................. 15 2.4.1.1 National Flood Insurance Program Participation ............................................................ 21 2.4.2 Administrative and Technical Capabilities .......................................................................... 21 2.4.3 Financial Capabilities ........................................................................................................... 24 2.4.4 Education and Outreach ..................................................................................................... 27 2.5 Hazard Mitigation Action Plan and Evaluation of Recommended Initiatives ............................. 29 2.5.1 2015 Initiative Review and Status ....................................................................................... 29 2.5.2 2020 Strategies ................................................................................................................... 36 i SNOHOMISH COUNTY HAZARD MITIGATION PLAN, VOLUME 2 | 2020 UPDATE TABLE OF CONTENTS 3 City of Arlington ............................................................................... 43 3.1 Hazard Mitigation Plan Points of Contact ................................................................................... 43 3.2 Jurisdiction Profile ....................................................................................................................... 43 3.2.1 Population and Employment .............................................................................................. 43 3.2.2 Development and Trends .................................................................................................... 43 3.2.3 Geography and Climate ...................................................................................................... 43 3.2.4 Governance ......................................................................................................................... 43 3.3 Risk Assessment .......................................................................................................................... 44 3.3.1 Jurisdiction-specific Hazard Event History .......................................................................... 44 3.3.2 Jurisdiction-specific Hazard Probability, Exposure and Vulnerability ................................. 44 3.3.3 Critical Infrastructure Risk Assessment ............................................................................... 46 3.4 Capabilities Assessment .............................................................................................................. 48 3.4.1 Planning and Regulatory Capabilities.................................................................................. 48 3.4.1.1 National Flood Insurance Program Participation ............................................................ 51 3.4.2 Administrative and Technical Capabilities .......................................................................... 51 3.4.3 Financial Capabilities ........................................................................................................... 53 3.4.4 Education and Outreach ..................................................................................................... 55 3.5 Hazard Mitigation Action Plan and Evaluation of Recommended Initiatives ............................. 56 3.5.1 2015 Initiative Review and Status ....................................................................................... 56 3.5.2 2020 Strategies ................................................................................................................... 57 4 City of Brier ...................................................................................... 60 4.1 Hazard Mitigation Plan Points of Contact ................................................................................... 60 4.2 Jurisdiction Profile ....................................................................................................................... 60 4.2.1 Population and Employment .............................................................................................. 60 4.2.2 Development and Trends .................................................................................................... 60 4.2.3 Geography and Climate ...................................................................................................... 60 4.2.4 Governance ......................................................................................................................... 60 4.3 Risk Assessment .......................................................................................................................... 61 4.3.1 Jurisdiction-specific Hazard Event History .......................................................................... 61 4.3.2 Jurisdiction-specific Hazard Probability, Exposure and Vulnerability ................................. 61 4.3.3 Critical Infrastructure Risk Assessment ............................................................................... 63 4.4 Capabilities Assessment .............................................................................................................. 65 ii SNOHOMISH COUNTY HAZARD MITIGATION PLAN, VOLUME 2 | 2020 UPDATE TABLE OF CONTENTS 4.4.1 Planning and Regulatory Capabilities.................................................................................. 65 4.4.1.1 National Flood Insurance Program Participation ............................................................ 70 4.4.2 Administrative and Technical Capabilities .......................................................................... 71 4.4.3 Financial Capabilities ........................................................................................................... 73 4.4.4 Education and Outreach ..................................................................................................... 75 4.5 Hazard Mitigation Action Plan and Evaluation of Recommended Initiatives ............................