Flathead Lake is Extraordinary

Let's Keep It That Way

Flathead Lake is an Extraodinary Place

Let's Keep It That Way

Flathead Lake is an Extraodinary Place

Let's Keep It That Way

Help Stop the Spread of Invasive Mussels

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.
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.

Quick Reference

Check Station Information

Check Stations
(Locations and Hours)

Ravalli, MT
Hwy 93, next to the highway maintenance shop in Ravalli, MT
Dates and Times to be Announced
Mandatory Class I Inspection Station—full inspection and decontamination capability

Thompson Falls, MT
Information Forthcoming
Mandatory Class I Inspection Station—full inspection and decontamination capability

Polson, MT
Inspections can be arranged by calling the CSKT office at 406 6th Avenue East, Polson (406) 883-2888 ext 7200 or by stopping in (calling in advance is recommended).
Courtesy Station, inspection and routing as needed

Kalispell, MT
MFWP Region 1 Office, 490 N Meridian Rd, Kalispell - 7 Days a week, 8 a.m.-5 p.m.
Courtesy Stations, inspection and routing as needed

Mack Days AIS Information

Mack Days AIS Update
Spring 2021
March 19 to May 16, 2021
Date of this Update: January 14, 2021

Because we are very concerned about AIS issues, Mack Days will require that all boats be inspected in 2021 before launching at any site on Flathead Lake and that proof of inspection be turned in with your first entries or before (you can email a copy of your proof of inspection to Cindy at cindy.benson@cskt.org). This is for the protection of the lake and everyone who cares about it.

Inspection stations will be open at an early date. Inspections may also be done at the CSKT NRD office in Polson or FWP Offices (call ahead)

OR

A Mack Days Inspection can be done at Blue Bay except for boats coming from out of state or any boat crossing over the Continental Divide.

When we have more information on sites for inspections we will get it out to you.

Thank you everyone and best of luck!

Help Stop the Spread of Invasive Mussels

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.
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.

Quick Reference

Check Station Information

Check Stations
(Locations and Hours)

Ravalli, MT
Hwy 93, next to the highway maintenance shop in Ravalli, MT
Dates and Times to be Announced
Mandatory Class I Inspection Station—full inspection and decontamination capability

Thompson Falls, MT
Information Forthcoming
Mandatory Class I Inspection Station—full inspection and decontamination capability

Polson, MT
Inspections can be arranged by calling the CSKT office at 406 6th Avenue East, Polson (406) 883-2888 ext 7200 or by stopping in (calling in advance is recommended).
Courtesy Station, inspection and routing as needed

Kalispell, MT
MFWP Region 1 Office, 490 N Meridian Rd, Kalispell - 7 Days a week, 8 a.m.-5 p.m.
Courtesy Stations, inspection and routing as needed

Mack Days AIS Information

Mack Days AIS Update
Spring 2021
March 19 to May 16, 2021

Date of this Update: January 14, 2021


Because we are very concerned about AIS issues, Mack Days will require that all boats be inspected in 2021
before launching at any site on Flathead Lake and that proof of inspection be turned in with your first entries or before (you can email a copy of your proof of inspection to Cindy at cindy.benson@cskt.org). This is for the protection of the lake and everyone who cares about it.

Inspection stations will be open at an early date. Inspections may also be done at the CSKT NRD office in Polson or FWP Offices (call ahead)

OR

A Mack Days Inspection can be done at Blue Bay except for boats coming from out of state or any boat crossing over the Continental Divide.

When we have more information on sites for inspections we will get it out to you.

Thank you everyone and best of luck!

Help Stop the Spread of Invasive Mussels


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.

Quick Reference

Check Station Information

Check Stations
(Locations and Hours)

Ravalli, MT
Hwy 93, next to the highway maintenance shop in Ravalli, MT
Dates and Times to be Announced
Mandatory Class I Inspection Station—full inspection and decontamination capability

Thompson Falls, MT
Information Forthcoming
Mandatory Class I Inspection Station—full inspection and decontamination capability

Polson, MT
Inspections can be arranged by calling the CSKT office at 406 6th Avenue East, Polson (406) 883-2888 ext 7200 or by stopping in (calling in advance is recommended).
Courtesy Station, inspection and routing as needed

Kalispell, MT
MFWP Region 1 Office, 490 N Meridian Rd, Kalispell - 7 Days a week, 8 a.m.-5 p.m.
Courtesy Stations, inspection and routing as needed

Mack Days AIS Information

Mack Days AIS Update
Spring 2021
March 19 to May 16, 2021

Date of this Update: January 14, 2021


Because we are very concerned about AIS issues, Mack Days will require that all boats be inspected in 2021
before launching at any site on Flathead Lake and that proof of inspection be turned in with your first entries or before (you can email a copy of your proof of inspection to Cindy at cindy.benson@cskt.org). This is for the protection of the lake and everyone who cares about it.

Inspection stations will be open at an early date. Inspections may also be done at the CSKT NRD office in Polson or FWP Offices (call ahead)

OR

A Mack Days Inspection can be done at Blue Bay except for boats coming from out of state or any boat crossing over the Continental Divide.

When we have more information on sites for inspections we will get it out to you.

Thank you everyone and best of luck!

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

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

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

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.

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.

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.