Press Kit

The Conococheague Aqueduct before restoration on a cloudy day.
The Conococheague Aqueduct on a cloudy day, pre-construction.

NPS | Monica Larcom

Conococheague Aqueduct Restoration Project Quick Facts

Groundbreaking Ceremony Press Release

The groundbreaking ceremony of the restoration of the Conococheague Aqueduct will take place on Friday, May 5, 2017, at 11:00 am in Williamsport, MD. This aqueduct along the Chesapeake and Ohio Canal National Historical Park is located at mile marker 99.6.

The next phase of the restoration project for the entire Williamsport interpretive complex will return the Conococheague Aqueduct to its 1920’s appearance and create the first watered, operational aqueduct along the C&O Canal since 1924.

The restoration project for the entire complex is a true federal-state-local partnership, with $6.24 million coming from a State of Maryland Transportation Alternatives Program Grant, $722,904 from a State of Maryland Bikeways Grant, and the remainder from the National Park Service. The Town of Williamsport has been an active, supportive and essential voice in bringing this project to fruition.

The Conococheague Aqueduct, second largest of the eleven aqueducts on the 184.5 miles of the C&O Canal, is listed on the National Register of Historic Places. Nearly 97 years ago, in April of 1920, the upstream wall of the Conococheague Creek Aqueduct gave way, crumbling into the creek below. The C&O Canal Company temporarily repaired the aqueduct with a wooden wall, but the canal only operated for three more seasons before being abandoned in the spring of 1924.

The project will restore the aqueduct to its appearance in the early 1920’s, with a new upstream wall designed to appear as the wooden temporary replacement wall. More importantly, the aqueduct will be restored to the condition where it can once again hold water, the first canal aqueduct to be restored to full operation. When complete, Williamsport, Maryland will be the only place in North America where visitors can ride boats across an aqueduct and through a working canal lock.

The Conococheague Aqueduct Restoration Project will provide a watered section of the canal to allow for canal boat operations and other public uses between Lock 44 and approximately 450 feet upstream of the existing aqueduct. During the project, the towpath across the aqueduct will be fully closed to public use and a temporary bypass established for thru-bikers and hikers.

Background Project Information

Conococheague Aqueduct Restoration Project Info Page

Partner Organizations

The Town of Williamsport, Md.

Maryland Department of Transportation

Visit Hagerstown & Washington County

A view looking at the Conococheague Creek from atop the Aqueduct walkway.
The Conococheague Aqueduct's missing side wall will be replaced with a 1920's era wooden wall.

Photo by Steve Dean

Frequently Asked Questions

What is the history of the Conococheague Aqueduct?

C&O Canal aqueducts are “water bridges” that carry canal boats over creeks and rivers that flow into the Potomac River. Built from 1833 to 1835, the Conococheague Aqueduct is the fifth of eleven such “works of art” on the canal. It consists of three equal 60’ arch spans extending 196’ between abutments. In August 1863 Confederate soldiers damaged the Conococheague Aqueduct in an effort to stop the canal’s transportation of coal to Georgetown where it was used by the Union. Repairs took four days and the canal returned to operation. In April 1920 a canal boat broke through the upstream wall of the aqueduct falling into the creek below. This shut down the canal for over four months. Repaired with a timber wall this aqueduct functioned until two 1924 floods closed the canal for good.

What is the need for the project?

The Conococheague Aqueduct is perhaps the most publically accessible aqueduct on the entire C&O Canal. It is in poor condition and will continue to deteriorate without stabilization and additional repairs. Additionally, completing this project will provide visitors with a nationally unique experience of being able to enjoy an interpretive boat tour across a watered aqueduct or to paddle their own boat through the aqueduct.

What does the project include?

The project includes constructing cofferdams within Conococheague Creek and rebuilding the aqueduct piers; rebuilding and lining the aqueduct prism so that it is safe, sustainable and watertight; repairs to the stone work; installation of a period-appropriate guardrail; clearing the canal prism upstream including constructing a berm; and removal of the existing berm on the downstream side so that entire stretch can be re-watered.

Thru-cyclists and hikers will be required to detour around the aqueduct and construction site by following a signed route using Fenton Ave, Route 68, and West Potomac Street (US 11).

To facilitate the work, construction equipment staging will require closing a section of the parking lot and towpath adjacent to the Cushwa Basin and also associated areas within and upstream of the project site. Additionally, temporary delays on the towpath approaching from the west (upstream) should be expected as work crews and equipment move to/from the work site. Work crews will access the work site from both upstream and downstream (from the Cushwa Warehouse side) of the Conococheague Creek Aqueduct.

When will the project begin and end?

Construction staging and work will begin summer 2017 and last for approximately 18 months. Anticipated completion is fall/winter of 2018/2019. During the work, the aqueduct and towpath immediately west (upstream) will be closed to the public. Visitors will continue to be able to access the towpath at Cushwa Basin and Lock 44 in Williamsport for local and downstream use. For west (upstream) access, the Gift Road Parking (mile 103.25) and Dam 5 (mile 106.8) both provide parking and towpath access. The National Park Service is doing everything possible to minimize closure time and impacts to visitors.

Why is it necessary to close the aqueduct and towpath immediately west of the project during the project?

Heavy equipment and materials will be in use throughout the project and will be actively moving in the aqueduct area and on the towpath immediately upstream of the project. Closing the area to public use provides for visitor safety and allows the work to progress in an efficient and timely manner resulting in a shorter project duration. For through cyclists and hikers, a temporary detour route will be clearly identified.

How will this project benefit park visitors?

Completion of this project will provide park visitors an opportunity to experience a watered transportation canal aqueduct. The project also restores a significant historic resource and provides unique opportunities for visitors.

How will this project impact natural and cultural resources?

The project helps protects a significant cultural resource by restoring and stabilizing the historic aqueduct piers preventing further damage and enhances the historic landscape. The project will return the aqueduct to working condition with the appearance of the early 1920s. Work in the Conococheague Creek will be timed to minimize impacts to fish and other aquatic species and the stream/river environments.

What is the park doing to protect those resources during the project?

National Park Service resource protection experts will be monitoring the contractor’s work in the stream to ensure environmental protection and the contractor’s work when working with the historic stone and masonry of the aqueduct. NPS managers will also monitor the contractor’s operations and visitor safety during the project with the goal of safely protecting this unique cultural resource and the environment surrounding the project. Every project undertaken by the National Park Service is conducted in compliance with the National Environmental Protection Act (NEPA), the National Historic Preservation Act (NHPA), and other regulations.

How do I visit the Cushwa Warehouse Visitor Center and have thru-passage when the aqueduct is closed?

Visitors will continue to have access to the Cushwa Warehouse Visitor Center and the towpath at Williamsport throughout the project. Additionally, visitors will be able to view the aqueduct restoration project from the Cushwa Warehouse and turning basin area. Hikers and bikers will continue to be able to access the towpath and go east/downstream during the project. A signed detour will be marked so that long-distance hikers and bikers will be routed around the aqueduct and construction site by following a signed route using Fenton Ave, Route 68, and West Potomac Street (US 11).

How much does the project cost?

Estimated costs for planning, design and construction is approximately $8.3 million. These funds are being provided by several sources including: a Federal “TAP” grant (Transportation Alternatives Program), NPS funds, Maryland Bikeways and Bond Bills programs, and park donations.

Who can I contact if I have further questions or concerns regarding the project?

Public Releases will direct questions to Matt Graves and Carrie Wittmer 301-582-0813.


Want to learn more?

Interested in learning more about the other ongoing projects we have in the Park? Check out our Park Projects page, or read our other Press Releases.

Last updated: April 24, 2018

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