Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
278374
| OR | Clackamas | Clackamas River, Cow Creek, 50-100 meters from the mouth. | 1999 |
17090011
| Clackamas | established |
40671
| OR | Clackamas | unnamed pond (secondary channel of Clackamas River - now diked) on Brownell Holly Farm (17251 S. Clackamas River Drive, Oregon City, OR) | 1991 |
17090011
| Clackamas | locally established |
1447378
| OR | Clatsop | Lewis and Clark River, Astoria-Warrenton Regional Airport mitigation bank wetland | 2017 |
17080006
| Lower Columbia | unknown |
877350
| OR | Columbia | McBride Creek, at mouth | 2015 |
17080003
| Lower Columbia-Clatskanie | established |
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 |
295300
| OR | Malheur | Lower Malheur (HUC8) non-specific | 2001 |
17050117
| Lower Malheur | established |
278362
| OR | Malheur | Owyhee River, below Owyhee Dam and above Snively Hot Springs. | 2001 |
17050110
| Lower Owyhee | established |
40665
| OR | Malheur | Snake River, Canyon No. 1 (at Oregon Dept of Transportation and Owyhee Irrigation District offices - near Ontario, OR) | 1995 |
17050115
| Middle Snake-Payette | established |
40668
| OR | Malheur | unnamed irrigation ditch (near Foothills Drive, Ontario, OR), Malheur River, Snake River drainage | 1995 |
17050117
| Lower Malheur | established |
40664
| OR | Malheur | unnamed irrigation drain (water source Kingman drain, near Kingman OR) Owyhee River, Snake River drainage | 1995 |
17050103
| Middle Snake-Succor | 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 |