| Impact ID | 5308 |
| Impact Type | Recreation |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | The threat of the spread of Dreissena polymorpha has made some authorities change the way water bodies are used, restricting watercraft from entering lakes to prevent new infestations. |
| Reference | 38231 |
| Cost | |
| Location | LAK Reservoir, Montana, USA |