Chambers Creek Foundation

Knockout Knotweed


In July 2008 Pierce County Public Works and Utilities will begin a project to locate and control the spread of Japanese knotweed in the Chambers Creek Canyon. The project is crucial to preserving native plant species and habitat in the Chambers Creek Canyon. Japanese knotweed is identified as a Class B Weed by the Washington State Noxious Weed Control Board. Knotweed reduces biodiversity by shading out native vegetation and altering habitats. It can also increase risk of flooding through dead stems washed into creek and stream channels. If the problem is left untreated, there is an increased risk of soil erosion and bank instability following the removal of established stands in riparian areas. Therefore it is prudent to control knotweed as early as possible.

Partners in the project include:
  • Washington Department of Natural Resources
  • Pierce County Noxious Weed Control Board
  • Pierce Conservation District
  • City of University Place
  • City of Lakewood
  • Clover Park Technical College
  • Clover Park High School
  • Chambers Creek Foundation
  • Chambers-Clover Creek Watershed Council

As the project progresses there may be opportunities for additional volunteers to assist with surveying and monitoring for knotweed infestations.

Contact Info

Please contact a Chambers Creek Properties Representative at 798-4050 or email us at

Japanese knotweed links