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New for Spring 2017 – Requirement to certify your boat as mussel-free to have your fish accepted by Mack Days.

Recent discovery of invasive mussels in central Montana has elevated the need to reduce the risk of infestation in Flathead Lake. Starting in 2017, Mack Days will not accept fish from boats that cannot provide proof of certification from an authorized inspector (we will take entries but not fish). Click here for information on inspection times and places and arranging your inspection.

Rules and Prizes

Boat Washing Requirements-please read

New for Spring 2017 – Requirement to certify your boat as mussel-free to participate in Mack Days-information will be sent out when we have stations set up for a certificate. We currently plan to inspect before and during Mack Days.


Click here for latest details.

Recent discovery of zebra mussels in central Montana has elevated the need to reduce the risk of infestation in Flathead Lake. This is a very serious concern. Starting in 2017, all boats used in Mack Days must provide proof of certification from an authorized inspector before participation in the contest. The inspection form must be presented with your contest application. Fish will not be accepted from anglers fishing from un-certified boats. Numerous inspection stations and times will be available prior to the event. We are organizing the information and personnel to implement this program and will announce details on the website and in other outlets as soon as planning is complete.

If you move your boat between water bodies suggested time frames after cleaning, draining, and then the drying (all water drained) if you suspect your boat may have been in contaminated waters or just to be on the safe side-is to dry: 7 days in the summer months June-August, 18 days in the spring March-May or in the fall months September-November, 30 days drying time in the winter December-February or freezing for 3 days. Be sure and do an inspection before launching into another water body. Mussels feel like fine sandpaper on the bottom of the boat or on equipment such as anchors and anchor lines.

Aquatic nuisance species are a real threat to our aquatic resources. Aquatic nuisance species have few natural predators or control agents. They can reproduce, grow rapidly, and threaten the ecological stability, diversity and abundance of native species. Aquatic nuisance species also threaten commercial, agricultural, aquaculture, and recreational activities. Boats, trailers, and equipment that come in contact with aquatic systems easily transport these exotics. Aquatic nuisance species can be introduced into new areas by the movement of water; they can also be transported to new sites attached to boats, trailers, and equipment. Many of the invasive species that threaten Montana have the ability to withstand extended periods of time out of the water or in small amounts of water making their transport to new locations possible. All participants in Montana fishing tournaments are asked to cooperate with Montana Fish, Wildlife, and Parks in the tournament requirements that all boats be washed prior to launching. Ensuring that all boats are clean of any plants or animals prior to being launched will help to prevent the spread of aquatic nuisance species. Report any sightings to the National Hotline: 1-877-786-7267.

Rules and Prizes

Boat Washing Requirements-please read

New for Spring 2017 – Requirement to certify your boat as mussel-free to participate in Mack Days-information will be sent out when we have stations set up for a certificate. We currently plan to inspect before and during Mack Days.

Recent discovery of zebra mussels in central Montana has elevated the need to reduce the risk of infestation in Flathead Lake. This is a very serious concern. Starting in 2017, all boats used in Mack Days must provide proof of certification from an authorized inspector before participation in the contest. The inspection form must be presented with your contest application. Fish will not be accepted from anglers fishing from un-certified boats. Numerous inspection stations and times will be available prior to the event. We are organizing the information and personnel to implement this program and will announce details on the website and in other outlets as soon as planning is complete.

If you move your boat between water bodies suggested time frames after cleaning, draining, and then the drying (all water drained) if you suspect your boat may have been in contaminated waters or just to be on the safe side-is to dry: 7 days in the summer months June-August, 18 days in the spring March-May or in the fall months September-November, 30 days drying time in the winter December-February or freezing for 3 days. Be sure and do an inspection before launching into another water body. Mussels feel like fine sandpaper on the bottom of the boat or on equipment such as anchors and anchor lines.

Aquatic nuisance species are a real threat to our aquatic resources. Aquatic nuisance species have few natural predators or control agents. They can reproduce, grow rapidly, and threaten the ecological stability, diversity and abundance of native species. Aquatic nuisance species also threaten commercial, agricultural, aquaculture, and recreational activities. Boats, trailers, and equipment that come in contact with aquatic systems easily transport these exotics. Aquatic nuisance species can be introduced into new areas by the movement of water; they can also be transported to new sites attached to boats, trailers, and equipment. Many of the invasive species that threaten Montana have the ability to withstand extended periods of time out of the water or in small amounts of water making their transport to new locations possible. All participants in Montana fishing tournaments are asked to cooperate with Montana Fish, Wildlife, and Parks in the tournament requirements that all boats be washed prior to launching. Ensuring that all boats are clean of any plants or animals prior to being launched will help to prevent the spread of aquatic nuisance species. Report any sightings to the National Hotline: 1-877-786-7267.

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