Salmon Overlay to the Snohomish Estuary Wetland Integration Plan
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Salmon Overlay to the Snohomish Estuary Wetland Integration Plan Prepared by: City of Everett and Pentec Environmental Salmon Overlay to the Snohomish Estuary Wetland Integration Plan Prepared by: City of Everett Planning and Community Development 2930 Wetmore Avenue, Suite 8-A Everett, WA 98201 and Pentec Environmental Project No. 253-002 120 Third Avenue S, Suite 110 Edmonds, WA 98020 (425) 775-4682 March 12, 2001 Cover photo by OPP*TION PHOTO This document was funded in part through cooperative agreements with the Governor’s Salmon Recovery Office (IAC Grant No. 99-1690 N) and National Oceanic and Atmospheric Administration (Grant No. G0000100). The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies. TABLE OF CONTENTS 1.0 Introduction.............................................................................................................1 1.1 Background..................................................................................................................... 1 1.2 Regulatory Setting/Relation to Other Plans.................................................................... 2 1.3 Objective of the Salmon Overlay ................................................................................... 2 1.4 Description of Document ............................................................................................... 4 2.0 Salmon Overlay Process and Methods ................................................................9 2.1 SSOTAC......................................................................................................................... 9 2.2 Description of Existing Resources ................................................................................. 9 2.3 SEWIP Tidal Habitat Model ........................................................................................ 11 2.4 Inventory and Description of Existing Conditions....................................................... 15 2.5 Hypothetical Development Scenario (HDS) ................................................................ 16 2.6 Compensation Process and Policies ............................................................................. 17 2.7 Management and Restoration Plan............................................................................... 18 2.7.1 Management of Development .......................................................................... 18 2.7.2 Restoration Potential ........................................................................................ 18 2.7.3 Restoration Plan ............................................................................................... 19 2.7.4 Implementation Plan......................................................................................... 19 3.0 Natural Resources of the Snohomish Estuary and Nearshore ........................21 3.1 Physical Environment................................................................................................... 21 3.1.1 Basin Characteristics ........................................................................................ 21 3.1.2 Historical Changes............................................................................................ 22 3.2 Ecological Management` Units .................................................................................... 22 3.2.1 EMU 1 – Fluvial Fresh Water (Forested Riverine/Tidal)................................. 24 3.2.2 EMU 2 – Fluvial Brackish Water (Emergent/Forested Transitional)............... 24 3.2.3 EMU 3 – River and Slough Mouths (Estuarine Emergent Marsh)................... 25 3.2.4 EMU 4 – Delta Sandflats.................................................................................. 26 3.2.5 EMU 5 – Lower Snohomish Channel .............................................................. 26 3.2.6 EMU 6 – Everett Harbor (East Waterway)....................................................... 27 3.2.7 EMU 7N, 7S – Port Gardner Nearshore, Tulalip Nearshore............................ 27 March 12, 2001 Table of Contents Page ii TABLE OF CONTENTS (continued) 3.3 Biological Resources .................................................................................................... 28 3.3.1 Vegetation......................................................................................................... 28 3.3.2 Salmonids ......................................................................................................... 30 3.3.3 Other Fish ......................................................................................................... 41 3.3.4 Invertebrates ..................................................................................................... 42 3.3.5 Other Wildlife................................................................................................... 43 4.0 Inventory and Description of Existing Conditions, Development Impacts, and Mitigation/Restoration Potential ..................................................................48 4.1 Overall Ranking of Assessment Units.......................................................................... 48 4.2 Ranking of Assessment Units by Ecological Management Unit.................................. 62 4.3 Salmonid Habitat Area and IVA-Acre Scores in the Snohomish River Estuary and UGA.......................................................................................................... 62 4.4 Ranking of AUs in the UGAs of Everett, Mukilteo, and Marysville ........................... 65 4.5 Hypothetical Development Scenario............................................................................ 65 4.6 Potential Development Impacts from the Hypothetical Development Scenario.......... 66 4.7 Potential Compensatory Mitigation/Restoration Opportunities in the Snohomish River Estuary............................................................................................. 81 4.7.1 Inside the UGA................................................................................................. 84 4.7.2 Outside the UGA .............................................................................................. 88 5.0 Compensatory Mitigation Policies and Process................................................91 5.1 General ......................................................................................................................... 91 5.2 Applicability................................................................................................................. 92 5.3 Focus of Compensatory Mitigation .............................................................................. 93 5.4 Constraints.................................................................................................................... 93 5.5 Compensatory Mitigation Policies ............................................................................... 94 5.6 Monitoring, Adaptive Management, and Contingency Plans..................................... 110 5.6.1 Standards and Performance Criteria............................................................... 110 5.6.2 Monitoring and Reporting Requirements....................................................... 112 5.6.3 Adaptive Management.................................................................................... 112 March 12, 2001 Table of Contents Page iii TABLE OF CONTENTS (continued) 5.7 Compensatory Mitigation Balance ............................................................................. 114 6.0 Management and Restoration Plan...................................................................122 6.1 Overall Salmonid Habitat Management Goals for the Estuary .................................. 122 6.2 Habitat Recovery, Restoration, and Enhancement Goals........................................... 124 6.3 Role of the Technical Advisory Committee............................................................... 126 6.4 Overall Restoration/Enhancement Potential............................................................... 126 6.5 Possible Restoration Scenarios................................................................................... 129 6.6 Preliminary Estuarine Recovery Plan......................................................................... 138 7.0 Implementation of the SEWIP Salmon Overlay................................................140 7.1 Historical Perspective................................................................................................. 140 7.2 What the SEWIP Overlay Provides............................................................................ 140 7.3 Link with WRIA 7 Efforts.......................................................................................... 141 7.4 Implementation of the SEWIP Restoration Plan ........................................................ 142 7.5 Adopt or Incorporate SEWIP into the Regulatory Framework of State and Local Governments.............................................................................................. 143 7.6 SEWIP as a Part of Project Review............................................................................ 144 8.0 References ..........................................................................................................146 Tables Listed on page vi. Figures Listed on page viii. Acronyms Listed on page x. March 12, 2001 Table of Contents Page iv TABLE OF CONTENTS (continued) Appendices A—Tidal Habitat Model Rationale and Protocols