Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
546666
| NE | Madison | Corporation Ditch, Norfolk | 1990 |
10220001
| Upper Elkhorn | established |
546799
| NE | Madison | Corporation Ditch, s edge Norfolk | 1991 |
10220001
| Upper Elkhorn | established |
748214
| NE | Madison | Elkhorn River at Route 81 bridge | 1987 |
10220001
| Upper Elkhorn | established |
748215
| NE | Madison | Elkhorn River, ca. 2 mi. S and 4 mi. W Norfolk | 1987 |
10220001
| Upper Elkhorn | established |
748213
| NE | Madison | Elkhorn River, Norfolk | 1987 |
10220001
| Upper Elkhorn | established |
546627
| NE | Madison | Republican River | 1991 |
10220001
| Upper Elkhorn | established |