You start riding up parallel to willow creek. A few hundred yards you will come to the Palisades Trail head. Stay left and ride the single track up 2 miles to the base of Red Lodge Ski Area. Turn around and head back for a pretty darn fun decent. This can be done as a shuttle. This trail is NOT buttery smooth, so bring a full suspension.
From US Hwy 212 (Beartooth Scenic Byway), go to the south end of Red Lodge, MT. Turn west on West Fork Rock Creek Road (Forest Road 2071). Go 1 mile and turn right on Palisades Campground Road. Go 1.8 miles to campground entrance on right. Trail begins at the far end of the campground.
http://www.singletracks.com/item.php?c=1&i=9545