Appendix G Shoreline Inventory and Assessment FINAL DRAFT SHORELINE INVENTORY AND ANALYSIS REPORT For City of Wenatchee Shorelines This report was funded in part through a grant from the Washington Department of Ecology. This document was prepared by the following consultants and has been modified by the City of Wenatchee: Prepared by: 750 Sixth Street South 710 Second Avenue, Suite 550 Kirkland WA 98033 Seattle WA 98104 ii Table of Contents Section ................................................................................................................ Page No. 1. Introduction .............................................................................................................. 1 1.1 Background and Purpose ......................................................................................... 1 1.1.1 Shoreline Inventory .................................................................................... 1 1.1.2 Shoreline Analysis ..................................................................................... 2 1.2 Study Area ................................................................................................................ 2 1.3 Shoreline Jurisdiction ............................................................................................... 3 1.4 Chelan County Watersheds ...................................................................................... 5 1.4.1 Geographic Context ................................................................................... 5 1.4.2 Historic Geology, Topography, and Drainage Patterns ............................. 6 1.4.3 Major Land Use Changes and Current Shoreline Condition ...................... 8 2. Current Regulatory Framework Summary ............................................................. 10 2.1 Existing Shoreline Master Programs ...................................................................... 10 2.2 Existing Critical Area Regulations .......................................................................... 11 2.3 City of Wenatchee .................................................................................................. 13 2.4 State Agencies/Regulations ................................................................................... 14 2.5 Federal Agencies/Regulations ................................................................................ 17 3. Shoreline Inventory ................................................................................................ 19 3.1 Land Use Patterns .................................................................................................. 24 3.1.1 Existing and Planned Land Use ............................................................... 24 3.1.2 Water-Oriented Uses ............................................................................... 25 3.1.3 Developing or Redeveloping Waterfronts ................................................ 27 3.2 Transportation ........................................................................................................ 28 3.3 Utilities .................................................................................................................... 30 3.3.1 Wastewater .............................................................................................. 30 3.3.2 Stormwater .............................................................................................. 30 3.3.3 Water Supply ........................................................................................... 31 3.4 Impervious Surfaces ............................................................................................... 32 3.5 Vegetation .............................................................................................................. 34 3.6 Shoreline Modifications .......................................................................................... 37 3.7 Existing and Potential Public Access ...................................................................... 38 3.8 Critical Areas .......................................................................................................... 41 3.8.1 Geologically Hazardous Areas ................................................................ 41 3.8.2 Frequently Flooded Areas ....................................................................... 41 3.8.3 Wetlands .................................................................................................. 42 3.8.4 Fish and Wildlife Habitat Conservation Areas ......................................... 42 3.8.5 Critical Aquifer Recharge Areas .............................................................. 45 3.9 Floodplains and Channel Migration Zones ............................................................. 46 3.9.1 Wenatchee River and Tributaries ............................................................ 48 3.10 Historical or Archaeological Sites ........................................................................... 50 3.11 Water Quality .......................................................................................................... 51 3.12 Opportunity Areas ................................................................................................... 53 4. Shoreline-Specific Conditions ................................................................................ 56 i 4.1 Stemilt/Squilchuck - Colockum (WRIA 40a/b) ........................................................ 56 4.1.1 Land Use Patterns ................................................................................... 57 4.1.2 Existing and Potential Public Access ....................................................... 64 4.1.3 Critical Areas ........................................................................................... 64 4.1.4 Potential Restoration Opportunities ......................................................... 64 4.2 Wenatchee (WRIA 45) ............................................................................................ 65 4.2.1 Land Use Patterns ................................................................................... 67 4.2.2 Existing and Potential Public Access ....................................................... 70 4.2.3 Critical Areas ........................................................................................... 71 4.2.4 Peshastin Urban Growth Area ................................................................. 72 4.2.5 Potential Restoration Opportunities ......................................................... 72 4.3 City of Cashmere .................................................................................................... 74 4.3.1 Potential Restoration Opportunities ......................................................... 75 4.4 City of Leavenworth ................................................................................................ 77 4.4.1 Potential Restoration Opportunities ......................................................... 77 4.9 City of Wenatchee .................................................................................................. 78 4.9.1 Land Use Patterns ................................................................................... 80 4.9.2 Existing and Potential Public Access ....................................................... 83 4.9.3 Critical Areas ........................................................................................... 84 4.9.4 Potential Restoration Opportunities ......................................................... 85 5. Analysis of Ecological Functions and Ecosystem-wide Processes ........................ 85 5.1 Assessment Methodology, Rationale and Limitations ............................................ 85 5.1.1 Methodology and Rationale ..................................................................... 85 5.1.2 Limitations ................................................................................................ 88 5.2 Ranking Tool Results ............................................................................................. 88 5.2.1 Stemilt/Squilchuck - Colockum (WRIA 40a/b) ......................................... 88 5.2.2 Wenatchee (WRIA 45) ............................................................................. 89 5.2.3 City of Cashmere ..................................................................................... 92 5.2.4 City of Leavenworth ................................................................................. 93 5.2.5 City of Wenatchee ................................................................................... 94 5.3 Function Assessments from Other Studies ............................................................ 96 5.3.1 Stemilt/Squilchuck - Colockum (WRIA 40a/b) ......................................... 96 5.3.2 Wenatchee (WRIA 45) ............................................................................. 97 5.3.3 Entiat (WRIA 46) .................................................................................... 104 5.3.4 Chelan (WRIA 47) .................................................................................. 106 5.3.5 Mid-Columbia Mainstem ........................................................................ 109 6. Land Use Analysis ............................................................................................... 110 6.1 Shoreline Land Capacity Analysis ........................................................................ 110 6.1.1 Stemilt/Squilchuck – Colockum (WRIA