Invasion

Invasion Description

1st Record: OR/lWillamette River (1894, Smith 1895; Lampman 1946; ).

Geographic Extent

OR/lWillamette River (Lampman 1946; USGS Nonindigenous Aquatic Species Program 2003); OR-WA/lower Columbia River (Lampman 1946; USGS Nonindigenous Aquatic Species Program 2003); Portland/OR/Columbia Slough (20008, Van Dyke et al. 2009)