| Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
|
40584
| OR | | Willamette River, lower, and lower Columbia River | 1909 |
17080003
| Lower Columbia-Clatskanie | established |
|
40583
| OR | Columbia | Columbia River, lower | 1946 |
17080003
| Lower Columbia-Clatskanie | established |
|
41554
| OR | Columbia | Prescott Slough, along highway 30 at Prescott Junction, west of Trojan Nuclear Power Plant. | 2001 |
17080003
| Lower Columbia-Clatskanie | established |
|
295990
| OR | Columbia | Prescott Slough, along highway 30 at Prescott Junction, west of Trojan Nuclear Power Plant. | 2009 |
17080003
| Lower Columbia-Clatskanie | established |
|
296000
| OR | Columbia | Prescott Slough, along highway 30 at Prescott Junction, west of Trojan Nuclear Power Plant. | 2013 |
17080003
| Lower Columbia-Clatskanie | established |