Is there an admission charge, if so what is it, and are you open on weekends and the hours?

There's no fees and there's a State Park souvenir shop also a small General Mercantile and if you go across the highway there's also World War 1 entrenchment that I kind of need to see

They do not charge to tour the mill

it's open on the weekends, not sure if they still charge if they do 5$