Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
36652
| MT | | Musselshell (HUC6) non-specific | 1990 |
10040200
| Musselshell | established |
1697860
| MT | Garfield | Kreider Reservoir #2 | 1999 |
10040205
| Lower Musselshell | eradicated |
850925
| MT | Garfield | Krieder Reservoir | 1985 |
10040205
| Lower Musselshell | established |
850924
| MT | Garfield | Krieder Reservoir | 1990 |
10040205
| Lower Musselshell | eradicated |
264305
| MT | Garfield | Musselshell River | 2000 |
10040205
| Lower Musselshell | established |
264306
| MT | Garfield | Musselshell River | 2003 |
10040205
| Lower Musselshell | established |
264275
| MT | Golden Valley | Careless Creek | 2001 |
10040201
| Upper Musselshell | established |
264276
| MT | Golden Valley | Musselshell River | 2003 |
10040201
| Upper Musselshell | established |
264297
| MT | Musselshell | Horsethief Creek | 2003 |
10040201
| Upper Musselshell | established |
264399
| MT | Musselshell | Musselshell River | 2001 |
10040202
| Middle Musselshell | established |
264398
| MT | Musselshell | Musselshell River | 2003 |
10040202
| Middle Musselshell | established |
264299
| MT | Musselshell | Musselshell River at bend | 2000 |
10040205
| Lower Musselshell | established |
264298
| MT | Musselshell | Musselshell River at bend | 2003 |
10040205
| Lower Musselshell | established |
264300
| MT | Musselshell | North Willow Creek | 2003 |
10040202
| Middle Musselshell | established |
264301
| MT | Musselshell | Parrot Creek | 2003 |
10040202
| Middle Musselshell | established |
264302
| MT | Petroleum | Box Elder Creek | 2001 |
10040204
| Box Elder | established |
264303
| MT | Petroleum | Elk Creek | 2002 |
10040203
| Flatwillow | established |
264308
| MT | Petroleum | Sacagawea River | 1999 |
10040205
| Lower Musselshell | established |
264307
| MT | Petroleum | Sacagawea River | 2003 |
10040205
| Lower Musselshell | established |
264452
| MT | Wheatland | Fish Creek | 2003 |
10040201
| Upper Musselshell | established |