It looked extremely alarming when I saw it in a slough open to the river and close to the currently proposed Baker Rock gravel pit on Grand Island. The shorelines along the same slough were also teeming with Purple Loosestrife. The site I looked at is off SE Upper Island Rd about a mile NE of the State Park river access. Where Upper Is Rd doglegs to the left, there is a pulloff and foot access to the right that leads to the slough. Coordinates from GoogleEarth are: 45º06’33.17”N, 123º00’33.49”W
Expert Reviewer
Mr. Vern Holm Director, Oregon Vegetation Management Association