if you guys go you can use this and its CFL and OTTAWA NATIONAL FOREST...around silver lake is a blast...north of ford road go straight where trail hooks east and then hook west on that fireroad that goes all out there...see EMBLAD CAMP....ELIASON CAMP...those roads...the entire area...until the snow melts...my latest is may 31st to june 2nd
http://www.vvmapping.com/trails/miSnow/PDF/VVMap_Big_Bay_1306.pdf
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trails are currently open till APRIL 15th in some parts....as per the DNR SNOWMOBILE RULES....
The opening and closing of snowmobile trails is at the discretion of each county. Snowmobile trails which cross DNR lands are opened and closed consistent with the surrounding county (or counties). Whenever possible, the opening and closing of snowmobile trails is done on a county-wide basis, however localized conditions may require localized trail opening and closing. It is the responsibility of the county to provide notification about the status of snowmobile trails