Mile 11.52 - The Marsden Tract campground has three campsites available for group camping.  The first site accommodates about 15 campers, the other two sites can each accommodate about twice that.  It's $20 per night and you can call (301) 767-3731 to book it.  This footbridge connects the campground with a small parking spot near MacArthur Boulevard and Brickyard Road.  This campground is open all year round.