Invasion

Invasion Description

1st Record: Portland/OR/Columbia River-Willamette River (Lampman 1946), 1st Record: Toledo/OR/Yaquina Bay (De Ben and Clothier 1990)

Geographic Extent

OR-WA/Columbia River-Willamette River (Lampman 1946; Hughes and Gammon 1987; Farr and Ward 1993); OR/Willamette River (Rkm 0.3-27, Farr and Ward 1993); Dibblee Point northwest of Rainer/OR/Dibblee's Slough, Columbia River (2001, USGS Nonindigenous Aquatic Species Program 2014), Toledo/OR/Yaquina Bay (De Ben and Clothier 1990), Riverton upstream to Myrtle Point./OR/Coquille River, the tidal portion (USGS Nonindigenous Aquatic Species Program 2014); Brandon Marsh National Wildlife Refuge/OR/Coquille River estuary (2007-2013, Silver et al. 2017)