Invasion

Invasion Description

1st Record: Portland/OR/Willamette River (1905, Lampman 1946)

Geographic Extent

Columbia river; Sauvies Island/OR/Columbia River; Portland/OR/Willamette River (River km 5. Hughes and Gammon 1987); OR/Willamette River (River km 1.8-14, Farr and Ward 1993)