Take exit 163 (Lorton Road, Route 642) west. After about 1.6 miles
(at the top of a hill), bear right on Furnace Road and follow it until
it meets Route 123 (Ox Road). Turn right on Ox Road and travel 1.2 miles
to Hampton Road where you will turn left. Go about 1/2 mile on Hampton
road and turn left on Van Thompson Road (you will see power lines
overhead, just in front of you). After about 1/4 mile Van Thompson bears
sharply to the left at a well weathered barn and continues down a hill
to the entrance to Sandy Run Park. Once there parking officials will
direct you to a parking spot.