Invasion

Invasion Description

1st Record: Salem/OR/Willamette River (1894, Lampman 1946)

Geographic Extent

Salem-Portland/OR/Willamette River-Columbia River (Lampman 1946; Hughes and Gammon 1989; Farr and Ward 1992; USGS Nonindigenous Aquatic Species Program 2014); Columbia River (R.M. 54) at Crims Island [~7 miles below Longview/WA/Columbia River (2005, USGS Nonindigenous Aquatic Species Program 2018).; Crimms Island (downriver from Longview WA/OR/Columbia River (Haskell and Tiffin 2011);; Reaaches D-H, mid-uppermost estuary/ColumbiaRiver (2010-2016, Sol et al. 2021)