Located in the Appalachian Mountains at 21843 National Pike, Boonsboro, MD 21713, Greenbrier State Park features a 42-acre man-made lake and white sandy beach. Lifeguards are on duty at the swimming area of the lake from 11 a.m. to 6 p.m., Memorial Day to Labor Day. Pets are allowed in day-use area and lake from the day after Labor Day to the Friday before Memorial Day.
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