Submitter does not have a specimen
EDRR Status: Local expert notified
Many fragments of milfoil being washed down the river. I did not locate the source of the fragments but suspect they may be growing in Clackamette Cove.
The leaves collapse and stick together when removed from the water, seeming less robust than the leaves of our native milfoils.
Photos at:
https://www.inaturalist.org/observations/250083344