| Impact ID | 7855 |
| Impact Type | Recreation |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Flathead Lake (MT) has been infested by monocultures of flowering rush (Butomus umbellatus) that have inhibited boat passage and reduced open water availability for swimming and fishing. |
| Reference | 25143 |
| Cost | |
| Location | Flathead Lake, Montana, USA |