Thornton Creek Landowner Information

In 2019, Forterra began surveying for knotweed along Thornton Creek. The ultimate program goal is to work with Thornton Creek residents to control invasive knotweed and restore healthy streamside vegetation.

Live on Thornton Creek?

Because knotweed spreads so easily, participation from all landowners is essential for effective control. The link below directs to a form which provides Forterra permission to survey, treat, and monitor knotweed on your property for a chosen duration of time at no cost to you.

2020 Knotweed Landowner Agreement

In this first year, Forterra will perform survey work only. In following years, we intend to return to assist landowners with knotweed control along Thornton Creek, and explore the status of knotweed on the surrounding tributaries. If you choose to give us permission for multiple years, this waiver will allow Forterra and our Washington Conservation Corps crew to also control knotweed on your property in the future.

By participating in this program, you’re contributing to a landscape scale effort to improve water quality and restore salmon habitat in your watershed. You’re also preventing damage to your property and septic systems, and our community’s roads. Healthy watersheds require every landowner to be a steward of their environment, so we thank you for your participation!

Knotweed Control on Thornton Creek

In fall of 2017, the Thornton Creek Alliance and partners King County, Seattle Parks, Seattle Public Utilities, the City of Shoreline, Earthcorps, and Forterra, convened for the first time to discuss a coordinated effort to control knotweed in the Thornton Creek Watershed. In March 2018, the parties completed a strategic plan to guide these efforts. Thornton Creek Alliance led the charge in mapping knotweed and other noxious weeds in the watershed.

Thornton Creek Weed Mapping

In 2019, Forterra began surveying for knotweed along Thornton Creek. The ultimate program goal is to work with Thornton Creek residents to control invasive knotweed and restore healthy streamside forests.

What is knotweed and why control it?

Knotweed (polygonum spp.) is a bamboo-like, non-native plant that wreaks havoc on properties and ecosystems. Once established, knotweed forms dense stands that crowd out native vegetation and clog small waterways, increasing bank erosion and lowering the quality of riparian habitat for fish and wildlife.

Knotweed spreads rapidly and is remarkably difficult to remove. Winter floods and beaver activity can bring knotweed to your property, so even if you haven’t seen it before, you may have a new infestation on your property.

Learn More – King County Noxious Weeds
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