It must be a looong time since you rode up there because you haven't been able to ride to the glacier in many years. Back in the early 80's we used to drive our trucks up to the lake at the base of the glacier. I didn't visit again until around 2002 and the road all the way up was blocked with massive boulders. We were on dirt bikes then and were able to pick our way thru the boulders about a third of the way up, then couldn't make it anymore. Oddly enough, the trail isn't gated or signed as being closed to OHV, someone just went to a LOT of effort to barricade it from OHV use. With the new MVUM maps I'm sure it's not on there anyway. There's miles of cool 2-track between Central City and SMG though and trails that go to the North (Kingston Peak I think) but I've never been on that one.