Invasion

Invasion Description

1st Record: Salem-Portland/OR/Willamette River ((1891, Lampman 1946), 1st Record: US 101, bridge, Klamath/CA/Klamath River, near the mouth (1951, Coots 1956)

1st watershed record: CA/Copco Lake (1946, Coots 1956; Dill and Corone 1997; Moyle 2002). Four fish were caught in the reservoir in 1946,, and by 1956, were found from the Oregon border to the mouth of the river (Coots 1956).

Geographic Extent

Salem-Portland/OR/Willamette River ((1891, Lampman 1946; Hughes and Gammon 1987; Far rand Ward 1991); Portland/OR/Columbia Slough (Van Dyke et al. 2009); Mount Coffin, Longview/WA/Columbia River (1904, Lampman 1904); north of Knappa junction or Brownsmead junction off hwy 30/OR/Blind Slough (2001, USGS Nonindigenous Aquatic Species Program 2014); off Multnomah channel north of Scappoose, approximately 2.7 miles beyond Columbia County airport via Dike Road off hwy 30/OR/Santosh Slough, USGS Nonindigenous Aquatic Species Program 2014); Reaches B-H, lower to uppermost estuary (@010-216, Sol et al. 2021), US 101, bridge, Klamath/CA/Klamarh River, near the mouth (1951, Coots 1956)