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Mack Days Fishing Events will continue to require that anglers have AIS Inspections prior to participating in the event. Proof of inspection will be required when you enter your fish or they will not be counted. Although Montana law does not require inspections for all boaters, we will continue the requirement for consistency and to be sure that Flathead Lake is protected. We are especially concerned about anglers from out of the Flathead Basin. Inspections will be done at Blue Bay beginning March 13th. Please arrange times by calling 406-270-3386. (Anglers can also call Kalispell and Thompson Falls offices of Montana Fish, Wildlife & Parks for boat inspections.)

For inspections to go fast and smoothly, be sure your boat is clean, drained, and dry. No mud, dried plants, etc. in live wells, on lines, etc.

Thank you for your cooperation.

Flathead Lake is an Extraodinary Place

Let's Keep It That Way

Help Stop the Spread of Invasive Mussels


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Flathead Lake is one of the cleanest large lakes in the world. It is the crown jewel of the Crown of the Continent, and invasive mussels could ruin it. Let’s work together to protect and preserve this rare and priceless part of our collective heritage.

Tiny, razor-sharp shells would coat and clog every hard surface of the lake – rocks, boats, docks & dams.

Invasive mussels would ravage the lake environment.

They would devastate the lake fishery and cost taxpayers and property owners hundreds of millions of dollars. Protecting Flathead Lake from invasive mussels is up to all of us.

Clean Drain Dry is more than just a slogan. It's the key to keeping invasive mussels out of the lake. And stoping at check stations is not an option.
It's the law.

A vibrant fishery is a terrible thing to waste and 1.5 billion dollars is too much money to flush down the drain. We can't afford either.

Did you know that an adult female zebra mussel can release a million eggs a year and that the mussels that hatch from all those eggs will grow up to encrust any hard surface they can find?

  Watch the Public Service Announcement

Resources you need to prevent a mussel invasion.

Be a responsible boater. Don't let your legacy be the ruin of the crown jewel of the Crown of the Continent.