Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
36771
| MT | | Musselshell (HUC6) non-specific | 1990 |
10040200
| Musselshell | established |
265152
| MT | Fergus | Flatwillow Creek | 1987 |
10040203
| Flatwillow | established |
265196
| MT | Golden Valley | Musselshell River | 1984 |
10040201
| Upper Musselshell | established |
265336
| MT | Meagher | Alabaugh Creek | 1987 |
10040201
| Upper Musselshell | established |
265337
| MT | Meagher | Checkerboard Creek | 1987 |
10040201
| Upper Musselshell | established |
265340
| MT | Meagher | North Fork Musselshell River | 1987 |
10040201
| Upper Musselshell | established |
265341
| MT | Meagher | North Fork Musselshell River | 2005 |
10040201
| Upper Musselshell | established |
265348
| MT | Meagher | South Fork Musselshell River | 1987 |
10040201
| Upper Musselshell | established |
265719
| MT | Wheatland | American Fork | 1987 |
10040201
| Upper Musselshell | established |
265720
| MT | Wheatland | Big Elk Creek | 1951 |
10040201
| Upper Musselshell | established |
265721
| MT | Wheatland | Big Elk Creek | 1987 |
10040201
| Upper Musselshell | established |
265722
| MT | Wheatland | Musselshell River | 1983 |
10040201
| Upper Musselshell | established |
265723
| MT | Wheatland | Musselshell River | 1985 |
10040201
| Upper Musselshell | established |