Coal Creek sewer upgrade
September 1, 2021
New survey for alternative trail access during construction
The Coal Creek Sewer Upgrade project team is seeking feedback from nearby neighbors on parking and/or transportation options along Forest Drive Southeast in Bellevue. These options can help people access trails in the Coal Creek Natural Area when the Red Cedar Trailhead is closed for construction.
Follow the links below to give your input:
- Share your input on alternative parking for Coal Creek Natural area, now through September 17. Find the survey at this link .
- Invite us to meet with your group or organization.
- Call or email us to talk one on one: Contact Monica Van der Vieren at firstname.lastname@example.org or 206-477-5502.
- Contact us for hard copies of materials and information.
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King County Wastewater Treatment Division (WTD) will upgrade a regional sewer line that serves Bellevue and Newcastle. The existing pipeline was built between 1966 and 1991 in an area that looked different from today, with a smaller population. The pipeline is nearing its maximum capacity and needs to be upgraded to carry more wastewater and meet the growing needs of your community.
Once installed, the new sewer pipe is designed to serve your community for another 50 years or more.
Protecting the Coal Creek Natural Area
The existing Coal Creek Trunk is approximately 2.5 miles long and primarily follows the banks of Coal Creek in the Coal Creek Natural Area between Newcastle and I-405. The new pipeline alignment will move the active pipeline away from Coal Creek offering better protection to this sensitive environmental area.
The selected pipeline alignment also aims to decrease impacts to both the Natural Area and Coal Creek Parkway SE during construction.
This map shows the project work areas and the construction methods King County’s contractor will use in each area. The contractor will install about 10,800 feet of pipe to build the new Coal Creek Trunk Sewer and re-establish connections to the City of Bellevue’s sewer collection system.
King County’s designers work to reduce community impacts and inconveniences where possible. But on large projects like this one, inconveniences are unavoidable. People can expect up to 3-years closure at the Red Cedar trailhead, with a trail detour around the construction site. There will be traffic impacts during work close to the Parkway.
Keep up to date to make sure you have the latest news and information as final design continues.
Contact Monica Van der Vieren at:
If you’d like to receive email or text updates on the Coal Creek sewer upgrade project:
If you are just learning about the Coal Creek project, you can visit two online resources to learn more:
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