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 |
37886
| WA | | coastal waters | 1998 |
17100102
| Queets-Quinault | collected |
45734
| WA | | state non-specific | 1880 |
17000000
| Pacific Northwest Region | failed |
46012
| WA | Clark | Blue Lake, diked from the Columbia River | 1932 |
17080003
| Lower Columbia-Clatskanie | failed |
45739
| WA | Cowlitz | Silver Lake | 1888 |
17080005
| Lower Cowlitz | established |
45738
| WA | Cowlitz-Lewis | Cowlitz River | 1896 |
17080005
| Lower Cowlitz | established |
238799
| WA | Grant | Banks Lake (Grand Coulee Reservoir) | 2003 |
17020014
| Banks Lake | failed |
238800
| WA | Snohomish | Unnamed private lake near Monroe | 2003 |
17110009
| Skykomish | failed |