Sub Basin 23.2 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
- Watercourse adjacent to 4324 West Mercer Way
Background
This sub-reach has numerous headcuts. The channel has incised up to 15 feet into the bed pan. This condition poses risks to adjacent areas, private street, banks and upper slope stability, increased sedimentation, and loss o f habitat.
Description
Stabilize the upper 250 feet of watercourse adjacent to 4324 West Mercer Way by regrading and filling channel. Install boulder cascade at headcuts and beyond.
Project Timeline
Construction: Summer 2025
Estimated Budget
$202,157
Contact
Elayne Grueber, Capital Project Manager, elayne.grueber@mercerisland.gov , cell:206-549-1036
Status Updates
May 30, 2024
Due to the construction time-frame mandated by the regulatory permit, the construction schedule for this project has been shifted to the summer of 2025. Future updates for this project page will be provided in early 2025 with the commencement of the bidding process for contractor selection.
April 2024
Final design comments were sent to the consultant to incorporate into plans and specifications.
October 2023
We have received the US Army Corps of Engineers permit for this project. All required permits are now complete. Construction is planned for July and August 2024.
May 2022
The project received its Hydraulic Project Approval (HPA) from Washington Department of Fish and Wildlife on April 20. The HPA states that any work below the ordinary high water line (OHWL) of the stream shall be conducted between June 1 and September 30. This timing limitation is also known as the “fish window”. Therefore, obtaining the necessary permit from the US Army Corps of Engineers (USACE) in-time is key to having this project constructed this year within the timing limitation. As of the end of April, the USACE could not estimate a permit decision date citing lack of resources. The USACE indicates that it is in the process of hiring additional project managers to handle their workload.
April 2022
The project is currently in the permit review phase with the following two agencies.
Washington Department of Fish and Wildlife since March 2022.
US Army Corps of Engineers since March 2021.
February 2022
The project is currently in permit review with the US Army Corps of Engineers (USACE). The agency has been requesting design-related clarifications and the design team has been responding accordingly.
In December, SEPA review application was submitted. Public Notifications sent to the neighborhood on 1/10/22, with the public comment period ending on February 9th.
November 2021
The project is currently in permitting review with US Army Corps of Engineers (USACE). The agency has been requesting design-related clarifications and the design team has been responding accordingly.
SW101 Project Location (2 MB)