The Marine Corps Marathon Organization (MCMO) will hold the Marine Corps 17.75K at the national park near Dumfries. Over 2,000 runners will begin running the 11-mile course at 7 a.m., with the last participant estimated to finish around 11 a.m. Marathon organizers say that significant delays should be expected between 4:30 a.m. and 12 p.m. on event day.
Pleasant Road will be closed to vehicular traffic from 5:30 a.m. to 12:00 p.m.