Sub Basin 46a.3 Watercourse Stabilization
Project Status
To help keep area residents informed of our construction progress, we will post project updates to this site on a regular basis. Click here to see status updates.
Project Details/Neighborhood
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Open space just south of SE 53rd Pl
Background
Areas adjacent to the stream show signs of slope movement and erosion. Stream bank erosion may contribute to sedimentation downstream of East Mercer Way.
Description
Stabilize approximately 475 feet of the watercourse by regrading the channel bed, adding erosion remediation measures such as logs, rootwads, and replanting along the bank.
Project Timeline
Planning/Design: Q4 2023 to Q2 2024
Under Construction: Summer 2024 or summer of 2025, depending on length of State and Federal permit processes
Completed: Fall of construction year
Estimated Budget
$457,000
Contact
Elayne Grueber, P.E., Capital Project Manager, elayne.grueber@mercerisland.gov
Status Updates
April 2024
Consultant submitted the Preliminary Basis of Design (BOD) report that provided a condition assessment based on the consultant’s field visits and analysis. The report also provided potential design options for the remediation of the watercourse. The City is meeting with the consultant and regulatory agencies later in April to review proposed options and receive input from regulatory agencies on the project.
March 2024
The consultant has finished their initial review of the watercourse and will be submitting a Basis of Design Report that documents the watercourse condition and remediation options. The City is scheduling an on-site meeting with Consultant and Regulatory Representatives to review project and begin the permitting process.
December 2023
Staff are completing contracts with the engineering consultant in December and design work is expected to begin in January 2024.
October 2023
Statement of Qualifications for interested consultant were due October 6 and Northwest Hydraulic Consultants was selected as the consultant for this work. A schedule for design is expected by the end of October.
SW0111 Project Location (738 KB)