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Portland Water Bureau

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Herbicide Treatment to Control Invasive Weeds at Powell Butte Nature Park Underway

By Lindsay Wochnick

The Portland Water Bureau, in partnership with Portland Parks & Recreation and SSC Construction, Inc., is conducting contact spraying for weed control at Powell Butte Nature Park.

Spraying has begun and will continue during the summer months. 

The current spraying is focused around trees (maple, fir, oak, ash) and plants (yarrow, roses, willow) newly planted as part of the Water Bureau’s Powell Butte Reservoir 2 project’s re-vegetation plan. The spraying targets non-native, highly invasive, state-listed noxious weeds or City of Portland Nuisance Plants which, left untreated, would rapidly increase and interfere with the natural ecology of the park, including the newly established trees and plants. The treatment is carefully targeted and won’t be applied near water storage facilities.

The spraying is part of the City of Portland’s invasive management program and is required for compliance of permits conditions as required by our permit for Powell Butte phase II. The Water Bureau is using state certified pest control applicators for all weed control requiring herbicide and following strict guidelines of the Portland Parks Integrated Pesticide Management (IPM) Program

No portion of the park will be closed during the spraying operations. However, park users are encouraged to watch for signage and avoid areas which are actively being sprayed.

Members of the public who have questions about the contact spraying are encouraged to contact the Water Bureau Public Information team at 503-823-3028 or by e-mail.

Lindsay Wochnick
Public Information

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