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Lower Issaquah Creek Restoration at Lake Sammamish State Park Preliminary Design Report

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Lower Issaquah Creek Restoration at Lake Sammamish State Park Preliminary Design Report LOWER ISSAQUAH CREEK RESTORATION AT LAKE SAMMAMISH STATE PARK PRELIMINARY DESIGN REPORT Prepared for: Mountains to Sound Greenway Trust Seattle, WA and the Washington State Parks and Recreation Commission Olympia, WA Prepared by: Northwest Hydraulic Consultants Inc. Olympia, WA & The Watershed Company Kirkland, WA 18 September 2020 NHC Ref. No. 002003907 ACKNOWLEDGMENTS The Mountains to Sound Greenway Trust, Northwest Hydraulic Consultants and The Watershed Company would like to thank the following interest groups comprised of various organizations and individuals for their assistance and guidance in the funding and development of the Lower Issaquah Creek Restoration Conceptual and Preliminary Design. Throughout this report, the entities mentioned below are referred to as interest groups. • Washington State Parks and Recreation Commission (Landowner and Partner) • Washington State Recreation and Conservation Office • Muckleshoot Indian Tribe & Muckleshoot Indian Tribe Fisheries Department Staff • Snoqualmie Tribe & Environmental & Natural Resources Department Staff • Tulalip Tribes & Environmental Division Staff • Confederated Tribes and Bands of the Yakama Nation & Yakama Nation Fisheries Department Staff • City of Issaquah • Washington Department of Fish and Wildlife • King County Flood Control District • King County Kokanee Work Group • King County Water and Land Resources Division • Lake Washington/Cedar/Sammamish Watershed (WRIA 8) and WRIA 8 Technical Committee • Friends of Lake Sammamish State Park • The Boeing Company ii Project Funded By This project is funded in part by the Lake Washington/Cedar/Sammamish Watershed (WRIA 8) and the King County Flood Control District Cooperative Watershed Management Grant Program, the Washington State Salmon Recovery Funding Board (SRFB) via WRIA 8 and the Washington State Recreation and Conservation Office, and contributions from The Boeing Company. Lower Issaquah Creek Restoration at Lake Sammamish State Park III Preliminary Design Report Prepared by or under the direct supervision of: Casey Kramer, PE Kathryn Mozes, PE Principle Engineer Hydraulic Engineer DISCLAIMER This document has been prepared by Northwest Hydraulic Consultants Inc. in accordance with generally accepted engineering practices and is intended for the exclusive use and benefit of Mountains to Sound Greenway Trust and their authorized representatives for specific application to the Lower Issaquah Creek Restoration at Lake Sammamish State Park Project in Issaquah, WA. The contents of this document are not to be relied upon or used, in whole or in part, by or for the benefit of others without specific written authorization from Northwest Hydraulic Consultants Inc. No other warranty, expressed or implied, is made. Northwest Hydraulic Consultants Inc. and its officers, directors, employees, and agents assume no responsibility for the reliance upon this document or any of its contents by any parties other than Mountains to Sound Greenway Trust. Lower Issaquah Creek Restoration at Lake Sammamish State Park IV Preliminary Design Report TABLE OF CONTENTS 1 INTRODUCTION ..................................................................................................................................... 1 2 PROJECT HISTORY AND BACKGROUND ................................................................................................. 2 2.1 Community Engagement in Restoration ......................................................................................... 3 3 HYDROLOGY .......................................................................................................................................... 4 3.1 Watershed Analysis ......................................................................................................................... 4 3.2 Peak Flow Analysis ........................................................................................................................... 5 3.3 Lake Level Analysis .......................................................................................................................... 7 4 EXISTING REACH CONDITIONS .............................................................................................................. 8 4.1 Project Level Geology and Geomorphic History .............................................................................. 9 4.2 Project Level Channel Migration ................................................................................................... 13 4.3 Previous Riparian Restoration Efforts ........................................................................................... 13 4.4 Project Level Objectives ................................................................................................................ 14 4.5 Reach 1 .......................................................................................................................................... 16 4.5.1 Geomorphology ........................................................................................................................ 16 4.5.2 Habitat ...................................................................................................................................... 17 4.5.3 Infrastructure ........................................................................................................................... 18 4.5.4 Reach Objectives ...................................................................................................................... 19 4.6 Reach 2 .......................................................................................................................................... 19 4.6.1 Geomorphology ........................................................................................................................ 19 4.6.2 Habitat ...................................................................................................................................... 22 4.6.3 Infrastructure ........................................................................................................................... 23 4.6.4 Reach Objectives ...................................................................................................................... 25 4.7 Reach 3 .......................................................................................................................................... 26 4.7.1 Geomorphology ........................................................................................................................ 26 4.7.2 Habitat ...................................................................................................................................... 27 4.7.3 Infrastructure ........................................................................................................................... 27 4.7.4 Reach Objectives ...................................................................................................................... 27 4.8 Reach 4 .......................................................................................................................................... 28 4.8.1 Geomorphology ........................................................................................................................ 28 4.8.2 Habitat ...................................................................................................................................... 31 4.8.3 Infrastructure ........................................................................................................................... 32 4.8.4 Reach Objectives ...................................................................................................................... 33 5 OUTREACH AND ENGAGEMENT .......................................................................................................... 34 6 PREFERRED DESIGN ALTERNATIVE ASSESSMENT................................................................................ 37 7 PRELIMINARY DESIGN ANALYSIS ......................................................................................................... 46 7.1 Reach 1 .......................................................................................................................................... 46 7.1.1 Geomorphology ........................................................................................................................ 46 7.1.2 Habitat ...................................................................................................................................... 47 7.1.3 Infrastructure ........................................................................................................................... 48 7.2 Reach 2 .......................................................................................................................................... 48 7.2.1 Geomorphology ........................................................................................................................ 48 Lower Issaquah Creek Restoration at Lake Sammamish State Park V Preliminary Design Report 7.2.2 Habitat ...................................................................................................................................... 49 7.2.3 Infrastructure ........................................................................................................................... 50 7.3 Reach 3 .........................................................................................................................................
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