Fellas you are all several years behind the curve on this one. I'm guessing that nobody on this thread took the time to comment during the forest plan revision process when the USFS lined out all of these closures. The final Snowy Range Travel Management Decision has been out since June 2007, maps and all.
In short, roughly 1/3 of all of the roads in the Snowies are being closed. they sign them first & then come back thru with heavy equipment and bulldoze them in with berms and trees.
These areas are all still open to sleds, and the backcountry riding is not affected. However, the families that sled the southern Snowies are sure going to see a huge difference in the trails that are available to them.
A bright spot is that for the first time ever singletrack dirt bike trails have made it on the map.
It really seems to me that ATV's were the primary target of these closures, if you are an ATV guy you have taken it in the shorts big time.
It is ironic that they are out there tearing things up with heavy equipment in the middle of the forest that they let die in the first place, all in the name of keeping the evil public out.