Blue is a hiking trail in Middlesex County, Massachusetts. It is within Acton Arboretum, Wetherbee Conservation Land, Great Hill Conservation Land, Pratt's Brook Conservation Land, Annursnac Conservation Land, and Heath Hen Meadow Conservation Land. It is 3.7 miles long and begins at 228 feet altitude. Traveling the entire trail is 0.2 miles with a total elevation gain of 21 feet. Near the trailhead there are benches, a parking, and an information map. The Wetherbee Conservation Land conservation can be seen along the trail. The trail ends near the Great Hill Conservation Land, Acton Arboretum, Annursnac Conservation Land, and Heath Hen Meadow Conservation Land conservations and Great Hill (elevation 358 feet). There is also a shelter near the end of the trail.
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