Leschi South Marina Wave Attenuator and Facility Improvements
Updated: October 3, 2025
Fall 2025
Underwater clean-up and shoreline restoration are currently underway and will be completed by the end of the year. The remaining project components will be done in phases, following the schedule outlined below:
- Underwater Cleanup (September 2025): Removal of rubbish and other debris beneath the marina as environmental mitigation.
- Shoreline Restoration (September 2025): Restoring the shoreline, including removal of blackberries, and providing better public access. The kayak rack will be relocated to this area.
- Upland Utility Infrastructure (Anticipated to begin Spring 2026): Street and parking lot work to provide electrical, sewer, and water for the new facility.
- Breakwater and Moorage Construction (Anticipated to begin Fall 2026)
Location
Leschi South Moorage; 100 Lakeside Ave S.
Budget
$7.913 Million
Schedule
Underwater Cleanup: September 2025 through year-end
Shoreline Restoration: September 2025 through year-end
Upland Utility Infrastructure: Spring 2026
Marine Construction: Fall 2026
Project Description
This project will remove the existing timber fixed pier and adjacent floating dock, which are supported by creosote-treated piles and are nearing the end of their useful life. The existing pipe pile breakwater, which does not adequately protect the marina from wave action, will also be removed.
Once these facilities are removed, the project will install a large floating breakwater with a boat sewage pump-out facility, providing transient boat moorage and public access. Benches and a kayak rack will also be included. Currently, there is no public transient moorage or sewage pump-out facility in this part of Lake Washington, and the existing dock is not accessible to all ages and abilities.
In addition, divers will be employed to remove trash from the lake bottom beneath the marina, and the shoreline will be enhanced. The removal of creosote piles will benefit the aquatic ecosystem, and the new sewage pump-out facility will help keep Lake Washington clean.
Please watch the short video below to learn more about the project. Please note:
- The Washington Department of Fish and Wildlife (WDFW) has added a new requirement for shoreline restoration to the project, which is not included in the video below. Seattle Parks and Recreation (SPR) has worked with the community to minimize visual impacts, and WDFW approved those changes.