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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

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Garlic Mustard Partnerships and Maps

Fanno Creek Watershed

Current Program and Partners

In 2007, Clean Water Services surveyed the Tualatin River Basin for garlic mustard. A significant portion of the infestation was outside their boundary in the City of Portland. The survey found garlic mustard on roadsides and along streams in the headwaters of Fanno Creek and its tributaries Pendleton, Vermont, Woods, North Ash, South Ash, Restoration and Bridlemile creeks.

In 2008 and 2009, Portland's Environmental Services teamed up with Clean Water Services to work on garlic mustard eradication. Clean Water Services contacted property owners along Fanno Creek and its tributaries requesting permission to look for and spray garlic mustard on their property over the next five years.

Since 2010, Environmental Services and Clean Water Services have continued this partnership. If you are a streamside property owner in the area mapped on the right and you have not yet signed up to have your property inspected and treated, please call Mitch Bixby of Environmental Services at 503-823-2989. 

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Tryon Creek Watershed

Current Program and Partners

In spring 2012, Environmental Services staff and licensed contractors will treat roadside garlic mustard infestations along Boones Ferry Road, SW Lancaster, SW Arnold and SW Capitol Highway. Volunteers with the Friends of Tryon Creek State Park will map and remove garlic mustard in the Tryon Creek State Natural Area. Portland Parks staff and volunteers will remove garlic mustard in Marshall Park and Foley Balmer Natural Area. 

West Willamette Watershed

Current Program and Partners

The West Willamette Restoration Partnership (WWRP) is a collaborative effort among the City of Portland,

West Multnomah Soil & Water Conservation District and local and volunteer organizations to control invasive weeds. WWRP’s focus is the southwest hills of Portland along Terwilliger Boulevard and Marquam Nature Park. WWRP members are working to control garlic mustard on trails, in road rights-of-way, and in stream corridors.

From April through June, expect to see contractors working on garlic mustard control. These are licensed contractors using treatment methods consistent with the City of Portland Integrated Pest Management Strategy. They will hand pull garlic mustard and apply herbicide. 

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Willamette Watershed (Southeast Portland)

Portland Parks and Recreation is working with Environmental Services to remove garlic mustard from Oaks Bottom Park, and from parts of the Reed College campus. The plant is not known to occur in other parts of southeast Portland outside the Johnson Creek Watershed. If you see garlic mustard, please report locations to Mitch Bixby at 503-823-2989. 

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Johnson Creek Watershed

The Johnson Creek Watershed Council is mapping and treating garlic mustard in the Johnson Creek watershed. 

Forest Park

Portland Parks and Recreation and Environmental Services are mapping and treating garlic mustard in Forest Park and adjacent roadsides. 

Columbia Slough Watershed

Garlic mustard is being managed at Whitaker Ponds and along Portland Road. No other patches are known in the Columbia Slough watershed. If you find any, please report the location to Mitch Bixby 503-823-2989. 

Multnomah County

The East Multnomah and West Multnomah Soil and Water Conservation districts and Multnomah County Road Department are removing garlic mustard in unincorporated Multnomah County. City of Gresham staff have surveyed for garlic mustard.

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