I Concure, I called Garmen and spoke with them. The contact had no idea why this is the case. State, county and other forest service maps are avaiable, only for specific hiking handheld units.
On another note, with federal land management being what they are these days I doubt such maps would prove reliable as closures would be irksome to say the least. Reforestation in addition to wildlife resource restoration projects can close listed trails and roads on a day by day bases. District managers now have total authority regards access roads to include campgrounds being open or closed. You really don't know until you come upon such closure.
