| Name | Alias | Region | Drainage | Counties | 
|---|---|---|---|---|
| Aajker Creek | 3 | Gallatin | Gallatin | |
| Abrams Creek | 3 | Beaverhead | Beaverhead | |
| Adair Creek | ADAIR CR | 3 | Shields | Park | 
| Addition Creek | 3 | Big Hole | Beaverhead | |
| Adolph Creek | 3 | Upper Missouri | Gallatin | 
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