Prevent Aquatic Invasive Species

Two rangers inspect a large boat on a trailer.
Rangers inspect a boat for aquatic invasive species.

NPS/J. Bonney

Wyoming Game and Fish and Grand Teton National Park are concerned about the spread of Aquatic Invasive Species (AIS). The state of Wyoming is trying to minimize the threat to waterways by mandating inspections for all boats entering the state, and requiring the purchase of a decal.

All boats entering Grand Teton National Park are required to stop for an AIS inspection. By law boats coming from out of state must be inspected or have valid proof of inspection before they launch on waters in the state, including waters in the park. This includes motorized boats, rafts, drift boats, canoes, kayaks, stand-up paddle boards, and all watercraft 10 feet and longer.

Learn more about Wyoming's AIS program.

For more information about AIS programs. Visit the following sites:

Aquatic Invasive Species Pose a Serious Threat to the Aquatic Ecosystem


Aquatic invasive species, such as whirling disease and zebra or quagga mussels, are a serious ecological and economic threat to the Greater Yellowstone Ecosystem. Any activities that come in contact with any body of water have the potential to spread non-native plants, pathogens, and other invasive species among water bodies. Follow these steps every time you come in contact with any body of water:

  1. Remove all visible mud, plants, fish, or other tiny animals from your boats, trailers, and other equipment, including waders, boots, clothing, and nets.
  2. Eliminate water from all equipment before transporting anywhere. Much of the recreational equipment used in water contains spots where water can collect and potentially harbor these aquatic hitchhikers. Drain your boat hull and live well in a safe location (a flat paved, dirt, or gravel area) away from all park surface waters.
  3. Clean and dry everything that comes in contact with water before entering a new body of water. It is best to use high-pressure, hot water (available at car washes outside the park) to clean your boat, trailer, and gear.
  4. Dry Equipment. If possible, allow 5 days of drying time before entering new waters.

Last updated: August 21, 2023

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Contact Info

Mailing Address:

P.O. Box 170
Moose, WY 83012


Talk to a Ranger? To speak to a Grand Teton National Park ranger call 307–739–3399 for visitor information Monday-Friday during business hours.

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