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City News / Press Releases

Posted on: July 1, 2020

King County Plans to Control Noxious Weed Infestations Along Snoqualmie River

Forwarded on behalf of King County

King County plans to begin their seasonal work of checking for and controlling noxious knotweed infestations along the Snoqualmie River corridor between the months of July and October. These noxious weeds are a significant threat to riverbanks.

In 2019, the project surveyed 550 acres in the river corridor along the main stem and the three forks above Snoqualmie Falls, and controlled 2.18 acres of knotweed in that area. Although much work remains to be done, many previously infested riverbanks are now nearly knotweed free and are being replanted with native trees and shrubs by our project partners the Snoqualmie Tribe, Mountains to Sound Greenway Trust, and King County Parks.

King County is getting closer to the goal of improving and restoring the riverbanks to increase bank stability, benefit runs of threatened salmon downstream and to preserve the natural and scenic beauty of the river.

All herbicide control for this project will be conducted with a state-approved, aquatic-formulated, low-risk herbicide and under a water-quality permit issued by the Washington State Department of Ecology.

They are not able to control knotweed that is far away from the river or outside our project area. To learn more about knotweed, visit or call 206-477-9333.

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