Don't Move a Mussel! Have your boat checked by a ranger before launching!
Imagine a future where going to your favorite rock-skipping beach, you find the shoreline matted with tens of thousands of small mussel shells, with everything cemented together in a sharp, smelly mess. Imagine once productive fisheries wiped out by these new invaders.
Since the 1980s freshwater zebra and quagga mussels have steadily advanced westward, transported on trailered boats. Very recently, a mussel-carrying boat was intercepted at a marina on Flathead Lake. The boat had come from the Southwest. Flathead Lake is just downstream from Glacier.
All watercraft require a friendly NPS inspection and permit before launching in Glacier. Prior cleaning, draining, and drying of all watercraft, both externally and internally, will reduce inspection time significantly.