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King County Washington home

Eastside Interceptor Section 14 Joint Repairs and Culvert Rehabilitation

This summer and fall, King County will repair a culvert that runs under the Eastside Interceptor Section 14 (ESI 14) underground sewer pipe. Crews will also build a retaining wall to support the slope at the site of the culvert and stabilize the stream near the culvert. This work will protect the ESI 14 sewer pipe.

The ESI 14 sewer pipe is a 7-foot diameter pipe, which carries about 2.6 million gallons of wastewater a day during dry weather. Last year, King County and City of Kirkland crews found a leak from the sewer pipe that was entering the culvert. King County coordinated with Public Health – Seattle & King County, and no public health risk was identified.

Crews repaired the ESI 14 sewer pipe in February. Crews installed a 3,000-foot temporary above-ground diversion pipe to maintain sewer service during the repair work. This pipe will remain on the west side of the trail to support summer culvert repairs. After crews complete their work, they will remove the diversion pipe and restore the site.

Project update

July 17, 2026

Now accepting public comments on environmental review

King County has completed the environmental review for this project under the State Environmental Policy Act (SEPA). SEPA helps us understand how a project is likely to affect the environment. The review looks at areas such as noise, water, wildlife, and transportation.

Based on the review, King County issued a Determination of Nonsignificance (DNS). A DNS means the project is not expected to have major impacts on the environment.

Environmental reviews are usually completed before construction begins. Because this project involved emergency repairs, work on the ESI 14 sewer pipe and the temporary culvert stabilization did not require a SEPA review before construction started. To make sure we looked at the project's full environmental impacts, this review includes both the completed repairs and the upcoming work.

The SEPA documents are posted here: http://kingcounty.gov/wtdenvreview

We are now accepting public comments on the environmental review through August 3.

How to submit comments

King County will accept public comments on the SEPA DNS through 11:59 pm on August 3, 2026. Comments should be submitted via email to WTDSEPA@kingcounty.gov or via regular mail to: 

Jacob Sheppard, Supervisor, Environmental Planning

King County Wastewater Treatment Division 

201 S Jackson Street, MS: KSC-NR-6200

Seattle, WA 98104-3855

 

Project location

Aerial photo displaying the Cross Kirkland Corridor, the above-ground pipe along west side of the trail with two metal plates with fencing at either end of the pipe, two trail access points from cross streets and two western access points that are blocked by the above ground pipe.