~9 miles @ ~14 min/mi

On 10 June Mary Ewell ran in Rock Creek Park with Ken Swab and me, so today we return the favor in her neighborhood. We start at historic Colvin Run Mill, just off Route 7 (near 38.970°N 77.294°W) and tootle downstream along the Fairfax Cross County Trail CCT Overview map which here follows Difficult Run. The weather is surprisingly cool and pleasant this near-midsummer morning, and with minor hesitations Mary navigates to the Potomac River, where we inspect the rocks of Great Falls and take photos of one another. On the trip back we divert onto the Ridge Trail and the Old Carriage Road in Great Falls Park, where Karen of the VHTRC greets us. She remembers Mary and me from Bull Run Run 2007. Several riders on sleek horses also pass by.