Snohomish County Multi-Jurisdictional Hazard Mitigation Plan 2020 Update Volume II September 2020 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 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 Mitigation Action Prioritization............................................................................................. 4 1.3.4 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 Critical Infrastructure Risk Assessment ............................................................................... 11 2.4 Capabilities Assessment .............................................................................................................. 13 2.4.1 Planning and Regulatory Capabilities.................................................................................. 13 2.4.1.1 National Flood Insurance Program Participation ............................................................ 18 2.4.2 Administrative and Technical Capabilities .......................................................................... 18 2.4.3 Financial Capabilities ........................................................................................................... 21 2.4.4 Education and Outreach ..................................................................................................... 24 2.5 Hazard Mitigation Action Plan and Evaluation of Recommended Initiatives ............................. 26 2.5.1 2015 Initiative Review and Status ....................................................................................... 26 2.5.2 2020 Strategies ................................................................................................................... 33 3 City of Arlington ............................................................................... 40 3.1 Hazard Mitigation Plan Points of Contact ................................................................................... 40 i SNOHOMISH COUNTY HAZARD MITIGATION PLAN, VOLUME 2 | 2020 UPDATE TABLE OF CONTENTS 3.2 Jurisdiction Profile ....................................................................................................................... 40 3.2.1 Population and Employment .............................................................................................. 40 3.2.2 Development and Trends .................................................................................................... 40 3.2.3 Geography and Climate ...................................................................................................... 40 3.2.4 Governance ......................................................................................................................... 40 3.3 Risk Assessment .......................................................................................................................... 40 3.3.1 Jurisdiction-specific Hazard Event History .......................................................................... 40 3.3.2 Critical Infrastructure Risk Assessment ............................................................................... 41 3.4 Capabilities Assessment .............................................................................................................. 43 3.4.1 Planning and Regulatory Capabilities.................................................................................. 43 3.4.1.1 National Flood Insurance Program Participation ............................................................ 46 3.4.2 Administrative and Technical Capabilities .......................................................................... 46 3.4.3 Financial Capabilities ........................................................................................................... 48 3.4.4 Education and Outreach ..................................................................................................... 49 3.5 Hazard Mitigation Action Plan and Evaluation of Recommended Initiatives ............................. 50 3.5.1 2015 Initiative Review and Status ....................................................................................... 50 3.5.2 2020 Strategies ................................................................................................................... 52 4 City of Brier ...................................................................................... 54 4.1 Hazard Mitigation Plan Points of Contact ................................................................................... 54 4.2 Jurisdiction Profile ....................................................................................................................... 54 4.2.1 Population and Employment .............................................................................................. 54 4.2.2 Development and Trends .................................................................................................... 54 4.2.3 Geography and Climate ...................................................................................................... 54 4.2.4 Governance ......................................................................................................................... 54 4.3 Risk Assessment .......................................................................................................................... 55 4.3.1 Jurisdiction-specific Hazard Event History .......................................................................... 55 4.3.2 Critical Infrastructure Risk Assessment ............................................................................... 55 4.4 Capabilities Assessment .............................................................................................................. 57 4.4.1 Planning and Regulatory Capabilities.................................................................................. 57 4.4.1.1 National Flood Insurance Program Participation ............................................................ 59 4.4.2 Administrative and Technical Capabilities .......................................................................... 60 4.4.3 Financial Capabilities ........................................................................................................... 61 ii SNOHOMISH COUNTY HAZARD MITIGATION PLAN, VOLUME 2 | 2020 UPDATE TABLE OF CONTENTS 4.4.4 Education and Outreach ..................................................................................................... 63 4.5 Hazard Mitigation Action Plan and Evaluation of Recommended Initiatives ............................. 64 4.5.1 2015 Initiative Review and Status ....................................................................................... 64 4.5.2 2020 Strategies ................................................................................................................... 66 5 Town of Darrington ......................................................................... 68 5.1 Hazard Mitigation Plan Points of Contact