Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
40405
| OR | | Columbia River | 1896 |
17080003
| Lower Columbia-Clatskanie | established |
40710
| OR | | Columbia River (probably referring to lower Columbia) | 1979 |
17080003
| Lower Columbia-Clatskanie | collected |
40399
| OR | | state non-specific | 1880 |
17000000
| Pacific Northwest Region | collected |
40709
| OR | | state non-specific | 1979 |
17000000
| Pacific Northwest Region | established |
40406
| OR | | Willamette River | 1896 |
17090000
| Willamette | established |
41929
| OR | Clackamas | Tualatin River | 1989 |
17090007
| Middle Willamette | unknown |
40517
| OR | Multnomah | Multnomah channel at the lower end of Sauvie Island | 1932 |
17090012
| Lower Willamette | established |
40516
| OR | Multnomah | Multnomah channel at the lower end of Sauvie Island | 1943 |
17090012
| Lower Willamette | collected |