Vegetation Management

Knotweed along Cedar Creek

Knotweed along Cedar Creek

County assistance (Sept 2020)

 "At this time during the pandemic, the field inspection program is focusing efforts on the highest priority species of noxious weeds: Class A, B and C species that are required for control.

Knotweed surveying will start Sept. 24th along Cedar Creek and Little Washougal in partnership with landowners. We will tackle knotweed found on the riverbanks and keep it from spreading. The goal is to help restore salmon habitat and improve water quality.  This is free to all land owners with the support of Washington State Department of Agriculture knotweed grant.  

Pasture surveys and responding to reports of all other species will be delayed.

When you let us know about an infestation, please email our office pictures of the noxious weeds that you are concerned about (size 10mb per email) to Please provide in-focus, close-up pictures of the flowers and leaves. Also please show scale in at least one picture with a standard-sized object such as a coin.  We will prioritize responding to reports that have pictures to go with them.

We’re here to help… from a distance!”

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Thank you,

Justin Collell

Coordinator, Clark County Noxious Weed Control Board

Clark County Vegetation Management is responsible, by state law, for controlling noxious weeds in Clark County. It is made up of five members of the Clark County Weed Board, appointed by the Board of County Councilors.

If you have received a warning letter and have questions please email us at or call us at call 564.397.6140.

If you or your neighbors have a problem with noxious weeds, email or call 564.397.6140.

The resources listed below will help you identify some common noxious weeds and business that help with removal:

Integrated Aquatic Vegetation Management Plan 

Thanks to our partners and the community for their involvement in help with the Final Integrated Aquatic Vegetation Management Plan to address Eurasian watermilfoil in Vancouver Lake.

For more information about the IAVMP, contact the Clark County Vegetation Management by email,, or by phone, 564.397.6140.  

DASH milfoil harvesting, photo credit Wisconsin Land and Water Conservation

Photo Credit: Wisconsin Land and Water Conservation

Help keep out invasive weeds

Clark County Vegetation ManagementWashington State Noxious Weed Control Board and the Washington Invasive Species Council are trusted resources.

Clean hiking boots, waders, boats and trailers, off-road vehicles and other gear to stop invasive species from hitching a ride to a new location. Learn more at

Avoid dumping aquariums or live bait into waterways. Learn more at Washington Invasive Species Council.

Don't move firewood. Instead, buy it where you'll burn it or gather it on-site when permitted. Learn more at

Use forage, hay, mulch and soil that are certified as "weed free." You can locate a supplier by using our list of local certified weed-free hay and mulch growers (PDF).

Plant only non-invasive vegetation in your garden and remove any known invaders.

Report new or expanded invasive species outbreaks to authorities. Here is  how to Report a Sighting.

Volunteer to help remove invasive species from public lands and natural areas.

Ask your political representatives at the state, local and national level to support invasive species control efforts.​​


Beeutify Seed Packet.jpg

Free Pollinator Friendly Flower Mix ​

Attract bees, butterflies and pollinators to your garden ​with this non-invasive pollinator friendly flower mix. ​

Order your free seeds today from the Washington State Noxious Weed ​Control Board.

More about weed control

Learn more about vegetation management in Clark County by watching this May 2017 CVTV video

Contacting Vegetation Management

Vegetation Management is located in Public Works' 78th Street Operations Center, 4700 NE 78th St., Building G.

Visitors should check in at Building A, located adjacent to Northeast 78th Street.

Phone: 564.397.6140

Vegetation Management   2020 events: 


Oct. 9th 9:30-12:30 

PNW IPC's Aquatic Species EDRR Citzen Science Training - webinar



Clark County Weed Board

2020 meeting dates:

  • Feb. 3
  • May 4 - teleconference
  • July 6 -  teleconference
  • Sept 21 - appeal hearing
  • Nov. 2

For more information, contact:
Justin Collell
Weed Board Coordinator
Clark County Public Works
(564) 397-6140 ext. 1766