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Which Weeds-Where?
Noxious Weeds
in Thurston County - Map (PDF Updated
12/01/09)
Maps are complex and fairly large in size, depending on your connection speed, it may require a generous and patient download time. Maps are in Adobe Acrobat format, Acrobat Viewer is required to view. Thurston County Noxious Weed Control is monitoring for 36 species of noxious weeds which are targeted for control out of a list of 86 designated by the State of Washington. The remaining 50 species have not yet been found in Thurston County, but are targeted annually through early detection surveys. All species of noxious weeds are non-native. Noxious weeds threaten public health, the environment, wildlife habitat, native plants, agriculture areas, and recreational areas. A risk assessment is used in prioritizing the weed list. To view our rationale, go to the Risk Assessment Chart. To see photographs of those species designated for control in Thurston County, go to the Noxious Weed List . Agency staff are surveying for the remaining 50 species not yet known to exist in Thurston County. This preventative effort to find species while they are limited, prevents them from becoming widespread. Prevention is the most effective control strategy . The weed program is focused on weeds of limited distribution where there is a possibility of eradication and preventing or reducing populations of noxious weeds to levels where impacts or injuries are low. The following problem weeds are found in Thurston County. These species are a problem because of their invasive nature, but are not listed for control due to population densities so high that eradication is not possible: Brazilian elodea (Egeria Densa), Canada thistle (Cirsium arvense), Eurasian Watermilfoil, Scotch broom (Cytisus scoparius), English Ivy, Policeman's Helmet (Impatiens glandulifera), and Yellow Flag Iris (Iris psuedacorus). Address questions or comments to: tcweeds@co.thurston.wa.us
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