2024 AC Water Main Replacement
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
- SE Gallagher Hill Rd (3700 Block to 3600 Block)
- Greenbrier Lane (SE 40th St, north to Gallagher Hill Rd)
- SE 40th St from Greenbrier Lane to 93rd Ave SE
- 93rd and 94th Ave SE from SE 40th St to SE 43rd St
- Crestwood Place
Background
The City’s water distribution system includes more than 113 miles of water mains of varying age, size, material, and condition. Most of the system is composed of cast iron and ductile iron pipe, but there are nearly five miles of asbestos-cement (AC) pipe and one mile of steel pipe. Pressurized AC pipe is a material known for developing leaks and breaks as it nears the latter part of its expected life. The AC pipe in the Mercer Island water system was primarily installed in the late 1950s and early 1960s, making it some of the oldest piping within the distribution system.
The purpose of this project is to systematically eliminate all AC water mains within the City of Mercer Island over a six year period by replacing approximately 5,000 feet of AC pipe per year. This is the first replacement project within the new AC Water Main Replacement Program.
Project Timeline
Planning/Design ( Q4 2023 – Q2 2024)
Construction Timeline(Q3 2024– Q2 2025)
Estimated Budget
$3.159 M
Contact
George Fletcher, Senior Project Manager: george.fletcher@mercerisland.gov
Status Updates
March 2024
Design work for replacing asbestos cement (AC) water mains is in the 90% design stage, with bidding planned for late May. A second water main project to replace aging and undersized mains is in the 60% design stage. Staff plan to stagger the construction of these two major projects, with the AC main starting in summer and the other project following a few months later. There will be additional AC main replacement projects over the next 6 years.
January 2024
This project has just completed a 15% review meeting and is moving forward to 60% design. Project is scheduled to advertise for construction bids in late spring 2024.
December 2023
The site survey for this project has been completed and staff will be meeting with the consultant soon to discuss preliminary location and alignments for the new water mains. A significant amount of this project is located within the Mercerwood neighborhood.
Planning/Design
In September of 2023, Consor North America, Inc was hired as the design consultant. Survey for this project begins in early November 2023 and should continue over the next several weeks.
WU0135 Project Location (648 KB)