Recommended Users: Mountain Bikers, Hikers. Singletrack trail. 0.05 miles in length. Difficulty: Easy/Easiest. McMullin Trail starts on the left just after the crossed the stepover at the trailhead. It is very short and leads to Cordura Trail. Turning left leads to the some of the last remains of pioneer community of Harrisburg. Turning right and continuing north for 0.20 miles leads to remains of a 1950’s Hollywood movie set. An interpretative panel provides more details. Loop: For an easy half mile loop, start at McMullin Trail. Visit the Harrisburg site and then continue north to the movie set. From the movie set head east to connect to the White Reef Trail just a few feet away. Turn right on White Reef Trail and head back to the trailhead.