Thunder Pass is a 12 mile hiking trail in Fort Collins, Colorado.
From Fort Collins, CO drive up Hwy 14, the Poudre Canyon, until you get to Cameron Pass about 60 mi from town. Park at the summit parking lot and ride across the road to the Michigan Ditch TH. There is a fee station just ahead $3.00/person
http://www.tripleblaze.com/trail.php?c=3&i=7962