North Lake Sammamish flow diversion
King County’s North Lake Sammamish Flow Diversion project team is working to identify the best options to divert wastewater to the Brightwater Treatment Plant, providing increased wastewater capacity for our growing region.
Watch for updates as the team’s work progresses.
Currently, flows from the North Lake Sammamish Basin are routed to the South Treatment Plant through the East Side Interceptor (ESI). This project will divert up to 43 million gallons per day of wastewater from the North Lake Sammamish Basin and send them to the Brightwater Treatment Plant.
|3Q 2017||Procure design consultant|
|1Q 2018||Alternative analysis complete|
|3Q 2018||Predesign complete|
|3Q 2019||Final design complete|
|1Q 2020||Bidding and award|
|1Q 2020 – 4Q 2021||Construction|