Chesapeake and Ohio Canal National Historical Park Guide
The Chesapeake and Ohio Canal National Historical Park stretches 184.5 miles from Georgetown, in Washington, DC, to Cumberland, Maryland. It follows the north bank of the Potomac River along a route that 19th-century engineers believed would connect the Ohio River to the Chesapeake Bay and open the interior of the continent to eastern commerce. The canal took 22 years to build, opened in 1850, and was rendered obsolete on the same day it reached Cumberland. The Baltimore and Ohio Railroad, which broke ground on the same July 4, 1828 groundbreaking ceremony as the canal, arrived in Cumberland first and proved faster, cheaper, and better suited to the terrain.
The canal operated for 74 years despite its inauspicious start, hauling coal, grain, and lumber downriver to Georgetown until a 1924 flood destroyed enough of the infrastructure to make repair economically unviable. The land sat in various states of federal ownership until it became a national historical park in 1971, largely because Supreme Court Justice William O. Douglas organized a famous 1954 protest hike of the full towpath to argue against a proposal to pave it as a parkway. The towpath is now one of the most-used recreational corridors in the mid-Atlantic.
What to Expect
Most visitors experience the C&O Canal in one of two ways: a day trip to Great Falls, or a multi-day bike tour of the full towpath. Both are legitimate and excellent options, but they involve entirely different experiences of the same linear park.
Great Falls, 14.5 miles upstream from Georgetown, is where the Potomac River compresses into a narrow gorge and drops 60 feet through a series of rapids and cascades. The views from the Maryland overlooks are dramatic, and the Billy Goat Trail along the river bluffs above the gorge is the most technically interesting day hike accessible from Washington, DC. On a busy spring or fall weekend, the Great Falls parking areas fill by midmorning. Arriving before 9 AM or visiting on a weekday avoids the worst of the congestion.
The towpath itself is flat. This is its defining characteristic. The towpath was built at canal level, which means it gains almost no elevation from Georgetown to Cumberland despite covering 184.5 miles through the Appalachian foothills. The surface is compacted gravel and crushed stone, suitable for road bikes and most hybrid bikes in dry conditions. Muddy sections after rain can make some stretches difficult. The NPS posts current trail conditions on the park website.
The canal's historical infrastructure is visible throughout. Seventy-four lift locks raised and lowered canal boats as the water level changed along the route. Lock houses, where lock keepers and their families lived year-round, appear at each lock. The NPS has restored several lockhouses for overnight rental: a genuinely unusual lodging option with an 1870s character that a motel cannot replicate. Aqueducts carried the canal over tributary streams. The Monocacy Aqueduct, near Dickerson, is the largest surviving stone aqueduct in the United States at 560 feet long and seven arches.
Best Trails
Billy Goat Trail (Section A)
3.8 mi, Out-and-Back, Strenuous
Section A of the Billy Goat Trail is the best hike in the DC metro area, and it is not particularly close. The route scrambles along the Potomac River bluffs on the Maryland side above Great Falls, requiring frequent use of hands and feet to work around and over large boulders. There are sections with real drop-offs to the river below. Navigation is by yellow blazes on rock, and several spots require route-finding when the obvious path disappears into a jumble of quartzite. Allow 2 to 3 hours for this 3.8-mile stretch, which is genuinely slow going in the technical sections.
The trail is accessed from the Great Falls Tavern Visitor Center. Sections B and C of the Billy Goat Trail continue downstream and are less technical (and less visited). Section A gets the majority of the traffic because it is the most dramatic. On a warm spring or fall Saturday, you will share the route with significant crowds in the popular sections. Weekday visits are quieter.
Great Falls Overlook Trails
1.0-2.0 mi, Out-and-Back, Easy
The short paths from the Great Falls Tavern Visitor Center to the overlook platforms give the most accessible views of the Potomac gorge without the scrambling required for Billy Goat Trail. The Olmsted Island overlook, reached by a footbridge over the canal and through a section of river island, puts you directly above the main falls on a platform with a clear downstream view of the gorge. This is where most families and casual visitors concentrate. The falls are impressive from here even without hiking the more strenuous routes.
C&O Canal Towpath (Georgetown to Great Falls)
14.5 mi, One-Way, Easy
The towpath section from the Georgetown terminus to Great Falls is the most commonly hiked or cycled section of the full route. The Georgetown trailhead is at the corner of Wisconsin Avenue and the C&O Canal in the Georgetown neighborhood of DC. The route is entirely flat, follows the canal through suburban Maryland, and arrives at Great Falls with good facilities and a visitor center. Out-and-back is 29 miles; most people arrange a car shuttle or use this as a cycling route and return via the same path.
C&O Canal Towpath (Full Route)
184.5 mi, One-Way, Easy
The full towpath is one of the most popular multi-day cycling routes on the East Coast. The combination of flat terrain, hiker-biker campgrounds every 5 miles (no fee as of 2026, first-come first-served), and historical interest along the route makes it accessible to a wide range of fitness levels. Most cyclists complete it in 3 to 5 days, camping at the towpath sites. The western section, approaching Cumberland through the Appalachian ridges, has the most dramatic scenery. The town of Cumberland marks the western terminus with a restored canal boat and visitor facilities.
When to Visit
Spring brings the towpath's most challenging conditions and some of its best scenery. Flooding is common in March and April after snowmelt and spring rain, and sections of the towpath may be closed for days or weeks at a time. Check the NPS website for current closures before planning a spring trip. When it is open, the wildflowers along the creek corridors (Virginia bluebells at the Carderock area are outstanding in April) and the high water in the river make spring one of the most memorable times to be here.
Summer is hot and humid, as DC summers are. The towpath is shaded by large sycamore and silver maple trees along much of its length, which helps. Great Falls is manageable in summer with an early start. Full towpath cycling trips in July and August are doable but demanding in terms of heat management.
Fall is the peak season for towpath cycling. Temperatures cool, the river sycamores turn yellow, the cottonwoods on the floodplain are golden in October, and the crowds are more manageable than the peak summer or spring wildflower weekends. The section from Harpers Ferry to Cumberland is particularly scenic in fall as the Appalachian hardwoods color.
Winter keeps the towpath open but closes some visitor centers. The towpath is a good winter hiking and running destination in dry conditions. After ice or snow, some sections become muddy and difficult. The lockhouses that are rented are available year-round.
Getting There and Logistics
The Great Falls area (the most visited section) is at 11710 MacArthur Blvd, Potomac, Maryland. From Washington, DC, take MacArthur Boulevard northwest from the Georgetown neighborhood approximately 14 miles to the park entrance. Metro does not serve Great Falls directly.
As of 2026, the entrance fee at Great Falls is $20 per vehicle for a 7-day pass. The America the Beautiful Pass covers this fee. Veterans with qualifying service-connected disabilities may be eligible for the Access Pass or the Military Annual Pass: see veteran benefits in national forests and parks for details. Access along the towpath away from Great Falls is free.
Lockhouse rentals are available through recreation.gov. They book weeks to months in advance, particularly for fall weekends. The lockhouses have no running water (some have an outhouse, some a composting toilet) and sleep 4 to 6 people. Some have a wood stove for heat. The NPS provides detailed descriptions of each lockhouse's amenities and location on the park website.
For the full towpath cycling trip, the traditional direction is eastern to western (Georgetown to Cumberland) to take advantage of the slight elevation gradient. Cumberland has shuttle services and bike shops that can arrange transport back to the start. Bike rentals are available in Georgetown and at several points along the lower towpath. Read checking conditions before you go for current flood closures and trail status before beginning any multi-day trip.
Planning Tips
- Spring flooding closes towpath sections with little warning. The NPS posts current closures at nps.gov/choh. If you are planning a multi-day trip in March or April, build flexibility into your schedule to route around closed sections.
- The Billy Goat Trail (Section A) is genuinely harder than its 3.8-mile distance suggests. People regularly underestimate it, turn back in the middle, or get stuck at difficult scramble sections with children. The NPS signage at the trailhead is explicit about the technical nature. Read it before starting.
- Lockhouses are one of the more unusual and rewarding overnight options in the mid-Atlantic. If you want to spend a night along the towpath without camping gear, booking a lockhouse far in advance is the path to it. They are simple but historically evocative: no phone signal, wood fire, river sounds.
- For a paired Maryland public lands day: the Catoctin Mountain Park and C&O Canal combination covers both the Appalachian ridge and the river corridor in a single trip from Frederick or the DC suburbs, with about 25 miles between the two parks.
- Green Ridge State Forest borders the towpath near its western end: the southern boundary of the forest abuts the towpath near Paw Paw, making a combined trip through western Maryland's ridge-and-valley terrain worth considering.
The C&O Canal is one of those places where the historical depth adds as much as the scenery. Walking or cycling the towpath along a canal that was obsolete before it opened, past lockhouses where families lived in isolation through Maryland winters, past the ruins of the canal industry that briefly defined this corridor, gives you a version of American history that a museum cannot quite match. Every mile of the towpath is public land, preserved because people in the 1950s argued it was worth keeping. Treat it that way. Follow Leave No Trace principles on every visit, pack out everything you carry in, and leave the lockhouse properties and historical structures exactly as you find them.