Beaver Brook Valley Preserve (Esker) is a hiking trail in Boxborough, Massachusetts. It is within Pettingell Park. It is a mile long and begins at 259 feet altitude. Traveling the entire trail is two miles with a total elevation gain of 248 feet. The Parking for Esker parking is near the trailhead. The Beaver Brook Valley Preserve and Pettingell Park conservations can be seen along the trail.
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