General Information: 503-823-4000
1221 SW 4th Avenue, Room 110, Portland, OR 97204
Updated: July 1, 2010. This guide to the native and nuisance plant species found in Portland and the metro region describes the ecological and social benefits provided by natives, as well as impacts and risks associated with the spread of invasives
Adopted by City Council, Ordinance No. 183534, Effective July 1, 2010 and July 1, 2011
Revisions to Clarify the ESEE Analysis
Ordinance 179540, effective September 26, 2005
Willamette River Inventory Update
The Natural Resource Inventory Update Project is a citywide project to revise and update existing information on natural resources (trees, streams, wildlife habitat, etc.) in Portland.