Invasion

Invasion Description

1st record: Troutdale, near Portland/OR/Sand River (Columbia River) (1883, Lampman 1946), 1st Record: Brandon Marsh National Wildlife Refuge/OR/Coquille River estuary (2007-2013, Silver et al. 2017)

Geographic Extent

OR-WA/Columbia River (1883,0 Lampman 1946); OR/Willamette River (Farr and Ward 1992; Hughes and Gammon 1987); (R.M. 54) at Crims Island [~7 miles below Longview, WA]/WA/Columbia River (2003, USGS Nonindigenous Aquatic Species Program 2014); Crimms Island (downriver from Longview WA/OR/Columbia River (Haskell and Tiffin 2011); Portland/OR/Columbia Slough (2009, Van Dyke et al. 2009); Rkm 0-30/OR-WA/lower Columbia estuary (1980, McCabe et al. 1983, 0-33PSU, rare); km 30-62/OR-WA/upper Columbia estuary (1980, McCabe et al. 1983, 0 PSU, rare); Reaches C to H (mid-upper estuRY Columbia River (2011-2016, Sol et al. 2021, Brandon Marsh National Wildlife Refuge/OR/Coquille River estuary (2007-2013, Silver et al. 2017)