Main Dike Trail is a hiking and horse trail in Concord, Massachusetts. It is within Great Meadows NWR-Concord Unit. It is 0.5 miles long and begins at 118 feet altitude. Traveling the entire trail is 0.9 miles with a total elevation gain of 4 feet. The Northern Red oak, Northern Red oak, Sweet Pepperbush, and White Oak trees, the Great Meadows lookout tower viewpoint, and the Great Meadows NWR-Concord Unit parking are near the trailhead. There are also information boards, a bicycle parking, and restrooms. The False Indigo, Autumn olive, Eastern Cottonwood, and Highbush Blueberry trees can be seen along the trail. There is also a viewpoint along the trail. The trail ends near the Black Willow tree. There is also a viewpoint near the end of the trail.