I don't know if all of these were said:
Timberlee Hills - closed 1972
Walden Hills - closed 1974
Holiday - closed 2001 (reopened a few years later by the locals as ski area for underprivileged kids)
Sugar Loaf - closed 2001
ski jump in Munising - closed in the 60's
Mt. Mancelona - ? looking for info
I'd love to go check them all out