Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
40718
| OR | | Chewaucan River | 1973 |
17120006
| Lake Abert | established |
40717
| OR | | Columbia River | 1973 |
17080003
| Lower Columbia-Clatskanie | established |
40716
| OR | | Snake River | 1973 |
17060101
| Hells Canyon | established |
40678
| OR | Benton | Benton County | 1994 |
17000000
| Pacific Northwest | established |
1335051
| OR | Benton | Long Tom River. | 2000 |
17090003
| Upper Willamette | established |
40511
| OR | Benton | overflow pond on Marys River south of Corvallis | 1945 |
17090003
| Upper Willamette | established |
40510
| OR | Benton | Willamette River just south of Corvallis | 1945 |
17090003
| Upper Willamette | established |
1335167
| OR | Harney | Burns | 1940 |
17120002
| Silvies | established |
1335042
| OR | Harney | Burns | 1940 |
17120002
| Silvies | established |
1335165
| OR | Lane | Oregon State Hwy. #36, 2.5 mi. W. of jct with U.S. Hwy #99, 4.5 mi. sw. of Junction City, in ditches beside road. | 1940 |
17090003
| Upper Willamette | established |
1335166
| OR | Linn | Just south of Corvallis. | 1940 |
17090003
| Upper Willamette | established |
1335056
| OR | Malheur | BATCH LAKE | 1974 |
17050108
| Jordan | established |
1335021
| OR | Malheur | BATCH LAKE | 1974 |
17050108
| Jordan | established |
1335028
| OR | Malheur | DUNAWAY POND | 1953 |
17050115
| Middle Snake-Payette | established |
41720
| OR | Malheur | Dunaway Pond, south of Nyssa | 2001 |
17050115
| Middle Snake-Payette | established |
297073
| OR | Malheur | Dunaway Pond, south of Nyssa | 2009 |
17050115
| Middle Snake-Payette | established |
297076
| OR | Malheur | Dunaway Pond, south of Nyssa | 2013 |
17050115
| Middle Snake-Payette | established |
1335046
| OR | Malheur | OWYHEE R. NEAR OWYHEE JCT. LARGE CLUMPS OF MYRIOPHYLUM | 1953 |
17050110
| Lower Owyhee | established |
297096
| OR | Malheur | Owyhee Reservoir, 20 miles southwest of Adrian | 2013 |
17050110
| Lower Owyhee | established |
40408
| OR | Multnomah | Willamette River at Portland | 1896 |
17090012
| Lower Willamette | established |
1335078
| OR | Wasco | MOSIER CR., IN TRIB OF DRY CR, POND CA 50 M ENE OF JUNCTION MORGENSEN & ROOT RDS | 1991 |
17070105
| Middle Columbia-Hood | established |
1335050
| OR | Wheeler | John Day River. Maps:250K-Bend, 24K-Rowe Creek, 100K-Stephenson Mountain. | 2002 |
17070204
| Lower John Day | established |