South of Ketchum, the Dinosaur Ridge is a 5.5 mile (300)mountain bike route through the BLM lands of Big Wood River Canyon near Magic Dam. Keep an eye out for Bald Eagles and River Otters.
To rech the trailhead from Ketchum, head south on SR75 for 36 miles. Turn right heading west at the Upper Big Woods River Access. Park just off the highway.
Overall, Dinosaur Ridge is the 6th most popular mountain bike trail of all 63 mountain biking rides in Idaho.