Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
161472
| OR | Columbia | south end of Scappoose Bay (Columbia River) in the associated wetlands on the Malarkey Ranch | 2004 |
17090012
| Lower Willamette | established |
163610
| OR | Columbia | south end of Scappoose Bay and in a small tributary that empties into it | 2004 |
17090012
| Lower Willamette | established |
40730
| OR | Multnomah | Burlington Bottoms, 15 mi NW Portland, several small interconnected waterbodies that abut the Multnomah Channel of the Columbia River | 1997 |
17090012
| Lower Willamette | established |
40731
| OR | Multnomah | Burlington Bottoms, 15 mi NW Portland, several small interconnected waterbodies that abut the Multnomah Channel of the Columbia River | 1997 |
17090012
| Lower Willamette | established |
278375
| OR | Multnomah | Miller Creek, at Fred's Marina ~60 m from the mouth. | 2002 |
17090012
| Lower Willamette | established |