The dry-laid stone wall to be repaired as part of this project. This wall is located on the berm side of the canal and directly supports public traffic on Harpers Ferry Road.
NPS | Joe Reed, Park Engineer
Harpers Ferry Road between Hoffmaster Road and the School Bus Turnaround on Sandy Hook Road is CLOSED.
The towpath between miles 61 and 62 is open. Maryland Heights Trailhead is open.
The park plans to reconstruct a historic dry-laid stone wall on Level 33 of the Chesapeake & Ohio Canal just across the Potomac River from Harpers Ferry, WV. This wall is located approximately at Mile Marker 61.5 on the C&O Canal and directly supports public traffic on Harpers Ferry Road. The wall is showing significant signs of instability and stone loss, causing distress on the supported public roadway.
The project aims to prevent future negative impacts to the local community that utilizes Harpers Ferry Road and preserve historic features of the C&O Canal by reconstructing the unstable section of stone wall and repairing the supported roadway. During monitoring of this wall, multiple changes of the wall, including stone loss have been noted. Several asphalt patches have been placed on this section of Harpers Ferry Road to mitigate the distress on the roadway.
Completion of the project will minimize the probability of future instability and reduce the risk of loss for the cultural & natural resources that are influenced by this substantial engineered feature.
Level 33 Dry-Laid Stone Wall Repair Project Detour Map
NPS | Engineering Services Team, C&O Canal NHP
CURRENT DETOURS AND CLOSURES
Harpers Ferry Road between Hoffmaster Road and the School Bus Turnaround on Sandy Hook Road is CLOSED.
The towpath between miles 61 and 62 is OPEN. Maryland Heights trailhead is OPEN.
Above is a map showing the project area and the detour that was activated on March 20, 2023. Harpers Ferry Road will be closed between Hoffmaster Road and the School Bus Turnaround at Sandy Hook Road. A detour will be available along alternate public roadways – the same detour that was used during the previous Harpers Ferry Road slope stabilization project. Once posted, vehicular traffic is asked to follow the detour signage along this stretch.
FREQUENTLY ASKED QUESTIONS (FAQs)
What is the need for the project?
The historic stone wall has experienced significant stone loss and sagging, leading to distress on the supported roadway. The wall and road have undergone several repairs over the past decades, including extending the wall from its original height. Recent changes in the horizontal and vertical alignment of the wall, as well as localized stone loss have already been observed. These conditions require stabilization to ensure the safety of the overlying road and increase the reliability of the underlying wall.
What does the project include?
The project consists of dismantling and rebuilding the critical failing section of the historic stone wall to restore its structural integrity. A few isolated areas of the wall outside the major repair segment will be stabilized without full wall reconstruction. During the early phases on the project, the roadway and guardrails supported by this wall will be removed and Harpers Ferry Road will be fully closed between Hoffmaster Road and the School bus turnaround on Sandy Hook Road (road closure began March 20, 2023 and is anticipated to extend into Fall 2023 - weather dependent). Concrete backfill and a temporary vehicle barrier will be installed to allow one lane of the roadway to be reopened later during construction for emergency/authorized vehicles.
At the end of the project, the pavement and guardrails along Harper's Ferry Road will be replaced and the road will be reopened to the public.
Current conditions showing ongoing construction work including removal of stones from the historic dry-laid stone wall supporting Harpers Ferry Road.
NPS | Joe Reed, Park Engineer
Where will the project take place?
This project will take place at approximately Mile Marker 61.5 of the C&O Canal towpath between Lock 33 (mile 60.7) and Lock 34 (mile 61.6) approximately 3.5 river miles downstream of the Dargan Bend Recreation Area, and 6.5 miles upstream from Brunswick, MD.
The project area (between Lock 33 & Lock 34) is upstream of the pedestrian bridge crossing Potomac River that connects the C&O Canal with Harpers Ferry, WV. This bridge will remain unaffected by the project.
When will the project begin and end?
The contractor mobilized for the construction phase February 6, 2023 and is anticipated to continue through Fall 2023, weather dependent.
How will this project impact park visitors?
The towpath adjacent to the project area (between miles 61 and 62) is open. Access to the Maryland Heights Trailhead will remain OPEN and can still be reached via the towpath footbridge at Mile Marker 61.27. The section of the towpath between Lock 34 and the project area will be shared with construction vehicles during the construction phase of the project. However, flaggers will be in place to ensure visitor safety.
Harpers Ferry Road (between Hoffmaster Road and the School Bus Turnaround on Sandy Hook Road) is currently closed. Beginning March 20, 2023, there will be no public vehicular access available along this section of the roadway. Later in the project, a single lane of traffic will be constructed to facilitate emergency/authorized vehicles to travel through the project area.
How will this project benefit park visitors?
Once the project is complete, the safety and reliability of the wall will be significantly increased. Additionally, the cultural & natural resources that are influenced by this substantial engineered feature will be preserved for current and future generations of visitors. The structure’s stability will be improved to meet current engineering standards and ensure safety to the local community that utilizes the roadway.
How will this project impact natural and cultural resources?
Every project the NPS executes undergoes review by a multidisciplinary team to ensure compliance with Section 106 of the National Historic Preservation Act (NHPA), National Environmental Policy Act (NEPA), and other federal, state, and local laws.
What is the park doing to protect those resources during the project?
NPS resource protection experts, engineers, and the construction contractor’s team will be monitoring the walls along this stretch of the canal, along with construction operations and visitor safety during the project with the goal of safely protecting the environment surrounding the project. Every project undertaken by the NPS is conducted in compliance with the National Environmental Protection Act (NEPA), the National Historic Preservation Act (NHPA), and other regulations.
How is the project funded?
The contract for the repairs to the historic dry-laid stone wall on Level 33 of the C&O Canal just across the Potomac River from Harpers Ferry, WV, was awarded in September 2022 for $1.9 million and was funded from the National Park Service’s Repair/Rehabilitation Program.
Who can I contact if I have further questions regarding the project?
Additional questions are to be directed to the park headquarters at 301-739-4200.
Left image
Pre-construction conditions showing sagging and stone loss of the historic dry-laid stone wall supporting Harpers Ferry Road.
Credit: NPS Photo | Joe Reed, Civil Engineer
Right image
Ongoing construction conditions showing stone removal from the historic dry-laid stone wall.
Credit: NPS Photo
Ongoing construction conditions showing stone removal from the historic dry-laid stone wall.
