Middlesex Fells Reservation, MA. Skyline Trail: 7 miles roundtrip loop Easy to Moderate Didn't want to head north for a hike today so I took advantage of the spring-like conditions and the short ride to the Middlesex Fells Reservation. Started the loop hike at Bellevue Pond parking area (fire gate #5). It was a pleasant hike with many hikers, bikers and dogs on the trail. I enjoyed the hike but next time I hike the Skyline Trail, I'd like to hike it in the clockwise direction. Blog & video of my solo hike along the Rock Circuit Trail here. Enjoy some photos taken along my hike. The only thing that was very uncool on my hike was seeing all these poo poo dog bags along the trail! It was just past the Sheepfold Parking Lot. Totally nasty!