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Clallam County Integrated Weed Management


Spotted knapweed on roadside2017 IWM Plan

This Integrated Weed Management (IWM) Plan is an update to the county vegetation management policy, last revised prior to 1990, as it relates to noxious weed control. The IWM Plan is intended to be revised annually in response to changing conditions and new technology.  It integrates all methods of weed control with the long term goal of developing naturally sustainable plant communities along County-owned right-of-ways and other County owned properties.  The County currently relies heavily on mowing for general vegetation management, which inadvertently causes weed infestations to spread.  The IWM Plan would expand the County’s toolbox for dealing with the most difficult to control or wide-spread noxious weeds of public concern. Methods would include promoting native seed mixes and pollinator-friendly forage, developing weed-free rock materials, and implementing targeted use of herbicides in select situations.

The IWM Plan shown here is intended to address the County’s obligations for noxious weed control on county owned lands in an integrated, responsible, and environmentally friendly manner.  An IWM plan is necessary to comply with state laws regarding noxious weeds, and to keep County owned lands from being sources of noxious weed seeds for other private and public properties throughout Clallam County.  The IWM plan covers not only county roadsides, but also rock sources and other Road Department administered lands. A copy of the IWM plan can be downloaded here.

Clallam County Ordinance 923, authorizing the use of an integrated weed management approach for noxious weeds and other plants of special concern on county managed lands, can be found here.

Roadsides and Other Sites Targeted for Herbicide Application in 2017

As part of the Road Department Integrated Weed Management Plan, each year a list of sites is compiled for potential herbicide applications.  Many of the sites initially targeted are those with weed infestations that are especially difficult to control through manual means.  In addition, a number of sites are those that were requested for control by Clallam County residents or organizations.  Together, targeted sites include roadsides, rock sources, and sites under Road Department responsibility.

A list of sites for herbicide application and 2017 treatment dates can be found here.


Owner Will Control Option

Property owners have the option to manually control noxious weeds on the right-of-way directly adjacent to their property by entering into an Owner Will Control Agreement with the County.  By entering into an Owner Will Control Agreement with the County, property owners agree to remove all above ground biomass and as much of the below ground parts of prohibited noxious weeds as possible. 

When entering into an Owner Will Control agreement, property owners assume the County’s responsibility under state laws RCW 17.10 and WAC 16-750 to control noxious weeds, which requires timely and often repeated control efforts during the growing season. The landowner would also assume any additional weed control responsibilities resulting from County policy. 

Property owners participating in control agreements may also be interested in assisting with cultural control enhancements consistent with long-term roadside weed control goals.  Such opportunities will be pursued as program resources and voluntary participation allow.

Owner Will Control Agreement applications can be found here.

Agreements must be signed and dated and returned to the Noxious Weed Control Board.  Signed agreements will then be signed by Weed Board staff and returned, which will serve as confirmation that the agreement is in place.  Please return signed agreements to:


Clallam County Noxious Weed Control Board

Attn: Roadside Coordinator

223 E 4th St. Suite 15

Port Angeles, WA 98362


Residents interested in helping the County with manual control of noxious weeds may “Adopt-A-Patch” from the list of approved locations found here.

To adopt a patch download and submit a permit application here. Applicants must be aware of all conditions and addendums included in Adopt-A-Patch Permit. Completed applications may be mailed, faxed or submitted in person. All fees normally associated with this permit have been waived.

In adherence to conditions of the permit applicants must be sure to complete and submit the following ActivityReport and any associated WaiverForm. All necessary paperwork must be completed and available on-site prior to begining any control work.

A limited supply of control tools and safety equipment is available to permit holders at the WSU Extension Office on a first come first serve basis.

Forms may be submitted in person to WSU Extension Office located on the first floor of the Old Clallam County Courthouse at 223 E 4th St, Port Angeles, WA 98362 or faxed to (360)417-2414. To submit by mail, pleae send to:

Clallam County Noxious Weed Control Board

Attn: Adopt-A-Patch

223 E 4th St. Suite 15

Port Angeles, WA 98362

Public Request

Have an area that you would like to see control measures carried out? County residents can submit requests for control measures to be performed by County staff. Every effort will be made to address requests made prior to the treatment season; additional requests will be addressed as time and resources allow or prepared for incorporation into the following year's plan.





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