Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
279521
| WA | Skamania | Hardy Creek, "Hardy Slough" section, 1 mi above junction with Columbia River. | 1997 |
17080001
| Lower Columbia-Sandy | established |
238847
| WA | Skamania | Ives Island, 2 miles downstream of Bonneville Dam, on the Columbia River | 2003 |
17080001
| Lower Columbia-Sandy | established |
238848
| WA | Skamania | Pierce Island, 2 miles downstream of Bonneville Dam, on the Columbia River | 2003 |
17080001
| Lower Columbia-Sandy | established |
862378
| WA | Skamania | Yeon Spring, at mouth | 2015 |
17080001
| Lower Columbia-Sandy | established |