Shoreline Inventory and Characterization (Appendix A)
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CITY OF SNOHOMISH SHORELINE MASTER PROGRAM Shoreline Inventory and Characterization Prepared for June 2010, updated May 2017 City of Snohomish City of Snohomish Shoreline Master Program Shoreline Inventory and Characterization Prepared for June 2010, updated May 2017 City of Snohomish 5309 Shilshole Avenue NW Suite 200 Seattle, WA 98107 206.789.9658 www.adolfson.com Los Angeles Oakland Olympia Petaluma Portland Sacramento San Diego San Francisco Tampa Woodland Hills D209491.00 OUR COMMITMENT TO SUSTAINABILITY | ESA helps a variety of public and private sector clients plan and prepare for climate change and emerging regulations that limit GHG emissions. ESA is a registered assessor with the California Climate Action Registry, a Climate Leader, and founding reporter for the Climate Registry. ESA is also a corporate member of the U.S. Green Building Council and the Business Council on Climate Change (BC3). 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Shoreline Inventory and Characterization City of Snohomish TABLE OF CONTENTS 1 INTRODUCTION .......................................................................................................................... 1 1.1 Background and Purpose ........................................................................................................... 1 1.2 Report Organization ................................................................................................................... 1 1.3 Overview of the Washington State Shoreline Management Act ................................................ 2 1.4 Shoreline Management Act Jurisdiction and Study Area Boundary .......................................... 3 1.5 Current Regulatory Framework ................................................................................................. 4 1.5.1 Existing Shoreline Master Program ..................................................................................... 4 1.5.2 Comprehensive Planning and Zoning.................................................................................. 4 1.5.3 Critical Areas Regulations .................................................................................................. 5 1.5.4 State and Federal Regulations ............................................................................................. 5 2 METHODS AND DATA INVENTORY ...................................................................................... 6 2.1 Data Sources .............................................................................................................................. 6 2.2 Establishing Shoreline Jurisdiction ............................................................................................ 6 2.3 Approach to Inventory and Reach-scale Analysis ..................................................................... 7 2.3.1 Analysis and Mapping ......................................................................................................... 8 2.3.2 Determining Reach Breaks .................................................................................................. 8 2.4 Approach to Assessment of Shoreline Functions ....................................................................... 9 3 ECOSYSTEM PROFILE ............................................................................................................ 11 3.1 Regional Overview .................................................................................................................. 11 3.2 Process Controls ...................................................................................................................... 13 3.2.1 Climate and Geology ......................................................................................................... 13 3.2.2 Vegetation ......................................................................................................................... 13 3.2.3 Land Cover ........................................................................................................................ 14 3.3 Ecosystem Processes................................................................................................................ 14 3.3.1 Hydrology (Surface and Groundwater) ............................................................................. 15 3.3.2 Sediment ........................................................................................................................... 16 3.3.3 Water Quality (nutrients, toxins, pathogens) ..................................................................... 17 3.3.4 Organic Materials (large wood) ........................................................................................ 17 4 LAND USE ANALYSIS .............................................................................................................. 19 4.1 Trends and Future Demand ...................................................................................................... 19 4.1.1 Shoreline Development Trends ......................................................................................... 19 4.1.2 Demand for Water-Dependent Uses .................................................................................. 20 4.1.3 Parks, Recreation, and Open Space ................................................................................... 20 4.2 Potential Use Conflicts ............................................................................................................ 21 5 SNOHOMISH RIVER ................................................................................................................. 23 5.1 Physical and Biological Characterization ................................................................................ 23 5.1.1 Process and Channel Modifications .................................................................................. 23 5.1.2 Drainage Basin, Tributary Streams and Associated Wetlands ........................................... 24 5.1.3 Geologic and Flood Hazard Areas .................................................................................... 24 5.1.4 Critical or Priority Habitat and Species ............................................................................. 25 5.1.5 Water Quality .................................................................................................................... 25 5.2 Shoreline Use Patterns ............................................................................................................. 26 5.2.1 Existing Land and Shoreline Uses ..................................................................................... 26 5.2.2 Shoreline Modifications .................................................................................................... 26 June 2010, updated May 2017 Page i Shoreline Inventory and Characterization City of Snohomish 5.2.3 Shoreline Environment Designations and Land Use ......................................................... 27 5.2.4 Existing Public Access ...................................................................................................... 28 5.2.5 Historical and Cultural Resources ..................................................................................... 28 5.2.6 Areas of Special Interest ................................................................................................... 29 5.3 Reach Scale Assessment .......................................................................................................... 29 5.4 Opportunity Areas ................................................................................................................... 31 5.4.1 Restoration ........................................................................................................................ 31 5.4.2 Public Access .................................................................................................................... 31 6 PILCHUCK RIVER .................................................................................................................... 32 6.1 Physical and Biological Characterization ................................................................................ 32 6.1.1 Process and Channel Modifications .................................................................................. 32 6.1.2 Drainage Basin, Tributary Streams and Associated Wetlands ........................................... 33 6.1.3 Geologic and Flood Hazard Areas .................................................................................... 33 6.1.4 Critical or Priority Habitat and Species ............................................................................. 33 6.1.5 Water Quality .................................................................................................................... 34 6.2 Shoreline Use Patterns ............................................................................................................. 35 6.2.1 Existing Land and Shoreline Uses ..................................................................................... 35 6.2.2 Shoreline Modifications .................................................................................................... 35 6.2.3 Shoreline Environment and Land Use Designations ......................................................... 35 6.2.4 Existing Public Access .....................................................................................................