...one for intermediate and one for advanced skiers and boarders. "It's progressive," said terrain park designer Jim Mangan of Aspen, Colo., on Thursday. "The jumps get a little bit bigger as you ride down it." Sourdough, accessible...

...built with $40,000 from a voter-approved parks-and-harbors ballot measure passed in 1998. The designer was Jim Mangan of Colorado, who oversaw construction of the two-mile Crazy T'rain park for the ESPN Winter X Games at Buttermilk...