On Dec. 21, 1951, The Ludington Daily News snow report listed Skyline as having 8″ new snow.
In a Consumers Power brochure from about 1959, Skyline is listed as being located 10 mi north of Roscommon, 1 mi east of the junction of US-27 and M-76. It had 7 slopes, 6 rope tows, instruction, night skiing, and a warming house with rental equipment and meals available.
In The Cass City Chronicle for Jan. 4, 1968, the AAA Michigan winter fun list says Skyline, 6 mi. south of Grayling, east off I-75 (US 27) on Roscommon Rd., had 10 slopes, a chairlift, 8 tows, x-c, and night skiing on Wed., Fri. and Sat.
Lately, they were listed as having 210′ vertical, 4 surface tows and a triple chairlift. A post on Yahoo Travel dated 12/10/08 lamented that Skyline was closed and up for sale.

http://maps.google.com/maps?q=Skyline+Road,+Grayling,+MI
http://www.snow-forecast.com/pistemaps/Skyline-SA_pistemap.jpg