Cedar Run is a small stream that spans 3.5 miles along the Northwestern edge of Quantico. Anglers have opportunities for wading or kayaking/canoeing. On-base access is allowed along Camp Upshur Road near Cedar Run Bridge. Cedar Run bridge is located at 38.622460, -77.528535. Park near the bridge, but off of the roadway. These coordinates can be copy pasted into Google Maps for directions.
Additionally, this area can be accessed by parking off-Base at the Merrimac Farm Wildlife Management Area.