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2018 Spring Mack Days Anglers:
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. The standard AIS Inspection Stations will not be open at the start of the event so our staff will conduct the inspections. We will try to be as accommodating as possible. Inspections can be arranged at our offices at 408 6
th Ave East in Polson during work hours starting February 26th. Please telephone 406-883-2888 ex. 7294 or 406-270-3384 to arrange a time. Inspections will be done at Blue Bay beginning March 13th. There will be inspections at the Somers boat ramp March 3rd from 9:00 till 4:00. Once Mack Days begins, we will do all inspections at Blue Bay. Please arrange times by calling 406-270-3386.
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.

Rules and Prizes

Boat Certification Requirements — please read

Requirement to certify your boat as mussel-free: To participate in Mack Days you must have your boat inspected and certified as mussel free. Information will be posted here once stations have been 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

Requirement to certify your boat as mussel-free: To participate in Mack Days you must have your boat inspected and certified as mussel free. Information will be posted here once stations have been 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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