Invasion

Invasion Description

1st record: OR/Coos Bay (1959, Mace and Mackie 1970; Carlton 1979)

Geographic Extent

Bear River Pilings/WA/Upper Palix River, Willapa Bay (2000, Cohen et al. 2001); Astoria/OR/Columbia River (1965, Haertel and Osterberg 1967; Carlton 1979); Fort Canby, boat launch, high and low marsh/WA/Columbia River (2002, Systma et al. 2004); culvert, Clatsop County/OR/Lewis and Clark River (Sytsma et al. 2004, USGS Nonindigenous Aquatic Species Program 2008); Windust/WA/Snake River, Lake Sacajawea (Draheim et al. 2006, USGS Nonindigenous Aquatic Species Program 2008); just south of Wallula/WA/Columbia River, Lake Wallula (Draheim et al. 2007, USGS Nonindigenous Aquatic Species Program 2008); OR/Tillamook Bay (1976, Carlton 1979); OR/Nestucca River (1976, Carlton 1979); Waldport/OR/Alsea Bay (1968, Carlton 1979); OR/Coos Bay (1959, Mace and Mackie 1970; Carlton 1979); Coos County/OR/Kentuck Slough, Coos Bay (1986, Carlton 1989; Coos County/OR/Larson's Slough, Coos Bay (1988, Carlton 1989); Coos County/OR Coos River (1988, Carlton unpublished data); Coos County/OR/Isthmus Slough (1989, Carlton 1989); Humboldt County/CA/Freshwater Lagoon (1975, Carlton 1979); Humboldt County/CA/Humboldt Bay (Mace and Mackie 1970; Carlton 1979)