It seems like there's always road construction everywhere you go. The good thing is GPSs always tells you about it
This is the place to get the most current park information. They've been advertising large scale construction projects for 2020 and 2021. More than the usual repairs, these are planned projects. https://www.nps.gov/glac/planyourvisit/conditions.htm
Every summer there is road construction in Glacier national Park, the location depends on where the damage from the previous winter snow has occurred. My best advice is to call the ranger station one week prior to your trip. There is only one highway that transects the park, the other highways circumnavigate.
I haven't been there yet I called the ranger station they reply within 72 hours, Great guys real sweethearts
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