Runners start and finish the out-and-back course for the Gar Williams Half at the Carderock Recreation Area, which lies just to the west of where I-495 and the Clara Barton Parkway meet. From there, runners follow the C&O Canal Pathway as it winds in tandem with both the canal and the Potomac River that separates Virginia and the District of Columbia, all the way down to the half-way turnaround point just past North Glebe Road.
Note: The course map above provides the approximate route for the race. Though every effort has been made to ensure its accuracy, changes are sometimes made to race routes due to weather conditions, road closures or other circumstances that can require a course to be changed. If you see an error above, contact us here.