Directions to River Creek: 
From the Beltway take Dulles Toll Road to right exit on Route 659, Belmont Ridge Road.  Follow Belmont Ridge Road to a left on Route 7 West.  Go West for a 1/2 mile to a right on River Creek Parkway. Proceed approx. 2 miles to Gatehouse on the right. 

Or

From the Beltway, take Dulles Toll Road to Exit 9 (Route 28 North).  Follow Route 28 north to a left on Route 7 West. Go west for 5.5 miles to a right on River Creek Parkway.  Proceed approximately 1.5 miles to Gated Entrance to River Creek on the right.

Tell the guard, you are visiting house number 43693 Augusta National Terrace. Follow the main road past the pond and water fountain, at the rise will be a road divider.  Take the first left, second right on Augusta National Terrace.  It is the third to last home on the right side.  The house has four white columns and a brown door.  Look for someone with huge smile! 

Here are the pictures: