Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
785921
| OR | Multnomah | Columbia Slough | 2014 |
17090012
| Lower Willamette | established |
238456
| OR | Multnomah | Ramsey Wetland [=Ramsey Lake] in Portland [near the mouth of the Willamette River] | 2007 |
17090012
| Lower Willamette | established |
785920
| OR | Multnomah | Willamette River, along east bank just upstream from the Ross Island Sand and Gravel Co. boat ramp | 2015 |
17090012
| Lower Willamette | established |
886066
| OR | Multnomah | Willamette River, east bank downstream of Ross Island | 2015 |
17090012
| Lower Willamette | established |
886065
| OR | Multnomah | Willamette River, near Riverdale | 2015 |
17090012
| Lower Willamette | established |