Sub Basin 22 & Sub Basin 25 b 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 

• Sub Basin 22- Watercourse lying west of West Mercer Way, near 4251 West Mercer Way

• Sub Basin 25b - Watercourse extends westerly from 84^th Ave SE downstream to Forest Ave

​Background

Stream banks have eroded over time, causing significant sedimentation downstream.

Description

Sub Basin 22- 140 linear feet of channel restoration will include regrading of the eroded channel, installation of streambed gravels, and placement of woody debris to stabilize the watercourse. Project will also include riparian planting along the banks.

Sub Basin 25b- 220 linear feet of channel restoration will include regrading of the eroded channel, installation of streambed gravels, and placement of woody debris to stabilize the watercourse. Project will also include riparian planting along the banks.

Project Timeline

Planning/Design (Q1 of 2024 – Q2 of 2024)
Construction Timeframe (Q3 of 2024– Q4 of 2024)

Estimated Budget

Sub Basin 22
Engineering $50,000
Construction: $130,000

Sub Basin 25b
Engineering $50,000
Construction: $100,000

Contact

Elayne Grueber, P.E., Capital Project Manager, elayne.grueber@mercerisland.gov  

www.mercerisland.gov/SW0132  www.mercerisland.gov/SW0133