Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
40411
| OR | | Willamette River | 1896 |
17090000
| Willamette | established |
242798
| OR | | Willamette River | 2007 |
17090000
| Willamette | established |
609265
| OR | Benton | MCFADDENS POND 12MI. S. OF CORVALLIS BENTON CO SWAMP C | 1957 |
17090003
| Upper Willamette | established |
609263
| OR | Benton | Middle Channel Willamette. Township - 12s. Range - 4w. Section - 30sw. Maps: 250k-Salem, 24k-Peoria, 100k-Eugene. | 2000 |
17090003
| Upper Willamette | established |
609266
| OR | Benton | SOAP CR. POND 7MI. N. OF CORVALLIS BENTON CO | 1976 |
17090003
| Upper Willamette | established |
164035
| OR | Benton | William L. Finley National Wildlife Refuge | 2005 |
17090003
| Upper Willamette | established |
1739594
| OR | Clackamas | [No locality description provided] | 2024 |
17090012
| Lower Willamette | |
164019
| OR | Clackamas | Tualatin River National Wildlife Refuge | 2005 |
17090007
| Middle Willamette | established |
40780
| OR | Clackamas | unnamed pond (secondary channel of Clackamas River) on Brownell Holly Farm | 1991 |
17090011
| Clackamas | established |
165299
| OR | Columbia | Big McNary Lake on Sauvie Island in the Columbia River | 1995 |
17090012
| Lower Willamette | established |
610312
| OR | Lane | FLAT CREEK | 1997 |
17090003
| Upper Willamette | established |
610311
| OR | Lane | LONG TOM R. OFF CLEAR LAKE RD. @ KIRK PARK IMM. DOWNST. OF BRIDGE IN RAPIDS & BACKWATER | 1998 |
17090003
| Upper Willamette | established |
609578
| OR | Linn | CALAPOOIA R. NEAR TNAGENT LINN CO | 1946 |
17090003
| Upper Willamette | established |
241419
| OR | Linn | Cox Creek, a tributary of the Willamette River located in Albany | 1996 |
17090003
| Upper Willamette | established |
40490
| OR | Linn | Linn County | 1882 |
17090000
| Willamette | established |
158555
| OR | Linn | Willamette drainage | 1980 |
17090006
| South Santiam | established |
1700724
| OR | Marion | [No locality description provided] | 2022 |
17090007
| Middle Willamette | |
163891
| OR | Marion | Ankeny National Wildlife Refuge | 2005 |
17090007
| Middle Willamette | established |
40492
| OR | Marion | Marion County | 1882 |
17090000
| Willamette | established |
1701508
| OR | Multnomah | [No locality description provided] | 2022 |
17090012
| Lower Willamette | |
163895
| OR | Polk | Baskett Slough National Wildlife Refuge | 2005 |
17090007
| Middle Willamette | established |
40494
| OR | Polk | Polk County | 1882 |
17090000
| Willamette | established |
1746751
| OR | Washington | [No locality description provided; coordinates obscured by collector] | 2021 |
17090010
| Tualatin | |
1739574
| OR | Washington | [No locality description provided] | 2024 |
17090010
| Tualatin | |
40500
| OR | Washington | Washington County | 1882 |
17090000
| Willamette | established |