Wishkah Road Floodwall Project Overview
The Wishkah Road Floodwall Project aims to replace 0.5 miles of sheet piling, upgrade culverts with tide gates, and enhance habitat. With a budget of $5 million, the project is currently 60% completed and on track for construction in summer 2017. However, there are challenges such as proximity to the Wishkah River and wetlands, structural design complexities, and lead time for materials. For more details, contact Rob Wilson, the county engineer for Grays Harbor County Public Works.
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Presentation Transcript
PRESENTATION #5 Wishkah Road Floodwall (GHC) www.ezview.wa.gov/graysharborfloodrelief www.ezview.wa.gov/site/alias__1492/34489/local_projects.aspx 12-06-2016 1 Lower Basin Share Session
Wishkah Road Floodwall Project Description/Overview: Approximately 0.5 miles for Sheet Piling Replacement of 6 culverts with Tide Gates Removable Flood Gates at 4 locations Cleanup & Habitat Improvements Engineers Estimate $5 Million 12-06-2016 2 Lower Basin Share Session
Current Status: On - Track Completed Activities: 60 % Design Submittal Completed Draft JARPA, HPA & Biological Assessments read for team review Coordination with Depts. of Ecology and Fish & Wildlife Complete On Schedule for Summer 2017 Construction 12-06-2016 3 Lower Basin Share Session
Upcoming Planned Activities: Permitting: JARPA Permit Submission Hydraulic Project Approval Submission Shorelines & Critical Areas Application Submission Biological Assessment Submission Engineering: 60% Plans, Specifications & Engineer s Estimates - Review w/ GHC Incorporation of Permit Approval Requirements & Comments Completion of Construction Ready Plans, Specs, and Engineer s Estimate Project Bid Manual Assembly, Bidding Support, and Construction Support 12-06-2016 4 Lower Basin Share Session
Controversies and/or Complexities: Permitting: Proximity to Wishkah River and Category 1 Wetlands Determination that drainage to culverts where not fish bearing Mitigation and Clean Up strategy Engineering: Structural design of the sheet pile wall in very poor soils Design of the South Wall Termination to Existing Concrete Retaining Wall Check Valve and Self-Regulating Tide gate Design Removable Flood Gate Design and Alternate Analysis 8-12 Week Lead time required for the necessary sheets to be milled and shipped to the site 12-06-2016 5 Lower Basin Share Session
Further Information: Grays Harbor County Public Works Rob Wilson, County Engineer 360 249-4222, rwilson@co.grays-harbor.wa.us 12-06-2016 6 Lower Basin Share Session
