Photo of a cul-de-sac.

90th Place Southeast

Construction is underway - sign up for updates to receive the start date when it's available.

King County Wastewater Treatment Division

This StoryMap focuses on 90th Place Southeast. To learn more about the Mercer Enatai Sewer Upgrade project as a whole, visit the   project website .

Map of the entire project area with North Mercer Pump Station on the Left and Sweyolocken Pump Station on the right. There is a line between the two showing the pipe alignment.

The blue line on the map shows the new sewer pipeline. King County is also upgrading the North Mercer Pump Station and the City of Mercer Island's Lift Station 11.

What are we building?

Map showing pipe route.

What to expect

Construction is disruptive.

We will send out alerts so you can plan ahead if you live near the active work area.

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Schedule and duration

Construction on the overall sewer upgrade will last through 2025.

This project on 90th PL SE is underway.

We will provide a more detailed schedule, including when your street might see construction, on our website and by email once it is available.

Construction schedules often change. Please  sign up to receive notifications  about work and schedules for this section of the project.

What you'll see when the work is done

We will repave 90th PL SE when construction is complete. We will not replace private landscaping in the right-of-way.

How to reach us

We are committed to working with you during construction.

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The blue line on the map shows the new sewer pipeline. King County is also upgrading the North Mercer Pump Station and the City of Mercer Island's Lift Station 11.