Skip to content
  • Team
  • Story
  • Projects
  • Publications
  • Services
  • Blog
  • Careers
  • Contact
  • Search

Sinnema Quaale Trail Protection and Habitat Enhancement

Flood-induced erosion led to loss of an old revetment and adjacent hill slope slumping through a 1,000-foot section of the Snoqualmie River bank. To protect the Snoqualmie Valley Regional Trail and a buried fiber-optic line immediately adjacent to SR 203, the County needed to reinforce the slope in ways that enhance habitat for salmonids and maintain the trail through this area. We led analysis, design, permitting and construction support for this large-scale bank stabilization project. We analyzed hydraulic and geomorphic conditions for several project alternatives with a 2D hydraulic model, leading to selection of a preferred alternative featuring large logs secured by timber piles at the toe of the bank, two steel sheet-pile walls on the slope above the log structures, and an upper structural earthen wall supporting the reconstructed trail and embankment. As part of this complex project, we managed a multidisciplinary team that include geotechnical engineers, structural engineers, and trail design experts.

Location
Carnation, WA
Owner
King County
Project Contact
Jeff Parsons, PhD, PE
Services
Ecological Surveys and Monitoring
Modeling and Data Analysis
River Wetland and Coastal Restoration
Unmanned Aerial Systems
Project Type
Civil Engineering

Related Projects

View all projects →

Ediz Hook Restoration

→

Nearshore Restoration at Fort Townsend State Park

→

Still Harbor Shoreline Restoration Feasibility Study at McNeil Island

→

Swift Creek Sediment Management Action Plan Implementation

→

Puget Sound Shore Friendly Program Support

→

Sun Canyon Road Resurfacing

→

Navigation

  • Team
  • Story
  • Projects
  • Publications
  • Services
  • Blog
  • Careers
  • Contact
  • Search

Our Offices

Seattle, WA

2200 Sixth Avenue
Suite 1100
Seattle, WA 98121
Phone (206) 441-9080
Contact: Phil Coughlan

Portland, OR

107 SE Washington Street
Suite 140
Portland, OR 97214
Phone (503) 228-4301
Contact: Ellen McClure

Missoula, MT

101 East Broadway
Suite 610
Missoula, MT 59802
Phone (406) 998-6760
Contact: Heidi Houck

Bellingham, WA

1329 North State Street
Suite 200
Bellingham, WA 98225
Phone (360) 398-5075
Contact: Chris Webb

Casper, WY

444 S. Center St.
Casper, WY 82601
Phone (206) 787-8219
Contact: Tyson Wright, PE

LinkedInFacebookTwitterInstagram

Join our Newsletter

Copyright © 2023 Herrera Environmental Consultants - Made by Needmore

Join Our Newsletter