| Impact ID | 7180 |
| Impact Type | Recreation |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | Mats of Ulva flexuosa washed up on the shores of Muskegon Lake during the bloom of 2003. This could discourage beach use by tourists. |
| Reference | 17219 |
| Cost | |
| Location | Muskegon Lake, Michigan, USA |