YELLOWSTONE NATIONAL PARK, Wyo. (AP) — All watercraft entering Yellowstone National Park's lakes must first pass an inspection for invasive species. National Park Service staff will also conduct daily inspections for all boats that launch from Bridge Bay, Grant Village and Lewis Lake boat ramps.

They will be looking for invasive species, such as New Zealand mudsnails, that can have significant destructive impacts on the park's natural resources. Motorized boating is allowed on Yellowstone and Lewis lakes. Only non-motorized boating is allowed on most other park lakes, and permits are required for all boats and float tubes.