Polson FLATHEAD LAKE MUSEUM Non-profit 501(c)(3) organization VISIT THE POLSON FLATHEAD LAKE MUSEUM SEE THE FLATHEAD LAKE MONSTER! Learn the history of homesteading on the Flathead Indian Reservation and much more! Come get a FREE Ice Cream following the 4th of July Parade! Open Monday-Saturday 10a-4p, Sunday 1-4p 708 Main St, Polson 223911 Polson FLATHEAD LAKE MUSEUM Non - profit 501 ( c ) ( 3 ) organization VISIT THE POLSON FLATHEAD LAKE MUSEUM SEE THE FLATHEAD LAKE MONSTER ! Learn the history of homesteading on the Flathead Indian Reservation and much more ! Come get a FREE Ice Cream following the 4th of July Parade ! Open Monday - Saturday 10a - 4p , Sunday 1-4p 708 Main St , Polson 223911