Chesapeake and Ohio Canal

Map of the path of the C&O Canal.

The Chesapeake and Ohio Canal, abbreviated as the C&O Canal, and occasionally referred to as the "Grand Old Ditch," operated from 1831 until 1924 parallel to the Potomac River in Maryland from Cumberland, Maryland, to Washington, D.C. The total length of the canal is about 184.5 miles (296.9 km). The elevation change of 605 ft (184 m) was accommodated with 74 canal locks. To enable the canal to cross relatively small streams, over 150 culverts were built. The crossing of major streams required the construction of 11 aqueducts. The canal also extends through the 3,118 ft (950 m) Paw Paw Tunnel. The principal cargo in the latter years was coal from the Allegheny Mountains. The canal way is now maintained as a park, with a linear trail following the old towpath, the Chesapeake and Ohio Canal National Historical Park.

History

Early river projects

After the American Revolutionary War, George Washington was the chief advocate of using waterways to connect the Eastern Seaboard to the Great Lakes and the Ohio River. Washington founded the Potowmack Company in 1785 to make navigability improvements to the Potomac River. The Patowmack Company built a number of skirting canals around the major falls including the Patowmack Canal in Virginia. When completed, it allowed boats and rafts to float downstream towards Georgetown. Going upstream was a bit harder. Slim boats could be slowly pulled upriver. The completion of the Erie Canal worried southern traders that their business might be threatened by the northern canal; plans for a canal linking the Ohio and Chesapeake were drawn up as early as 1820.

Building the canal

A boat on the canal, circa 1900-1924

In 1824, the holdings of the "Patowmack Company" were ceded to the Chesapeake and Ohio Company. By 1825, the Canal Company was authorized by an act of the General Assembly of Maryland in the amount of subscriptions of $500,000 authorized by the act of incorporation paved the way for future investments and loans. According to future historians (J. Thomas Scharf, "History of Baltimore City and County", published 1881, reprinted 1971), those financial resources were expended until unfortunately the State had prostrated itself on its own credit. The franchises, money and credit later not only exhausted the resources that might have been spent on the competing railways, but places obstacles in its path which retarded its progress. A few years later, the competing Baltimore and Ohio Railroad had capitization amounts and stock issued to the amount of over $4.1 million dollars.

Benjamin Wright, formerly Chief Engineer of the Erie Canal, (under construction from the state capital Albany on the Hudson River to Buffalo on Lake Erie, which would have great future national success), was named Chief Engineer of this new effort, and construction began with a groundbreaking ceremony near Georgetown on the north shore of the Potomac River, on the Fourth of July, (Independence Day), 1828, by sixth President of the United States John Quincy Adams. On the same day, the little more than one-year old Baltimore and Ohio Railroad also set its "First Stone" with the aging, sole surviving Signer of the Declaration of Independence, Charles Carroll of Carrollton to do the honors near the future town of Halethorpe, southwest of the city along the new first segment of the Main Line to Ellicott Mills on the falls of the Patapsco River's Southern or "Ferry Branch". The Little Falls - skirting Chesapeake and Ohio Canal was originally then at a depth of 4 feet, and had to be augmented to the C & O's depth of 6 feet.

The first president of the Canal, Charles F. Mercer, insisted on perfection since this was a work of national importance. This would cost the company more money to build the canal. During his term, he forbade the use of slackwaters for navigation or the use of composite locks (i.e. locks made from composite materials) or reduction of the cross section of the canal prism in difficult terrain. While it was to reduce maintenance costs, later such a policy caused problems due to construction costs being high and difficult to repay. In the end, two slackwaters (Big Slackwater above Dam #4, and Little Slackwater above Dam #5) and composite locks (from Lock 56-88, 69-71) were built anyways.

In March 1837, there were three surveys made for a possible link to the northeast to Baltimore: via Westminister, via Monocacy-Ligamore, and via Seneca, but they were all were deemed impractical due to lack of water at the summit level.

The narrow strip of available land along the Potomac River from Point of Rocks to Harpers Ferry caused a legal battle between the C & O Canal and the Baltimore and Ohio Railroad (B&O) in 1828 as both sought to exclude the other from its use. Following a Maryland state court battle involving Daniel Webster and Roger B. Taney, the companies later compromised to allow the sharing of the right of way.

The canal initially connected to the Potomac River on the east side of Georgetown by joining Rock Creek east of Lock 1, 0.3 miles (0.5 km) upstream of the Tidewater Lock, whose remnants still exist to the west of the mouth of the creek. In 1831, the first section opened from Georgetown to Seneca, Maryland. By 1833, the canal opened to Harpers Ferry, and at the Georgetown end it was extended 1.5 miles (2.4 km) eastward to Tiber Creek, near the western terminus of the Washington City Canal which extended into the future National Mall and the foot of the United States Capitol. A lock keeper's house at the eastern end of this "Washington Branch" of the C&O Canal remains at the southwest corner of Constitution Avenue and 17th Street, N.W., at the edge of the National Mall in Washington, D.C.

C&O Canal in the Georgetown neighborhood of Washington, D.C.

In 1836, the canal was used as a Star Route for the carriage of mails from Georgetown to Shepherdstown using canal packets. The contract was held by Albert Humrickhouse at $1,000 per annum for a daily service of 72 book miles. The canal approached Hancock, Maryland, by 1839. In 1843, the Potomac Aqueduct Bridge was constructed near the present-day Francis Scott Key Bridge to connect the Chesapeake and Ohio Canal to the Alexandria Canal which led to Alexandria, Virginia.

Building the last 50 miles was a major obstacle. Although the final locks (70-75) had been completed earlier than 1842, all but an 18 1/2 mile segment had been done, including the Paw Paw tunnel, the deep cut at Oldtown, and 17 locks. Since it was difficult to obtain stone for the locks, composite locks, sometimes made with kyanized wood were made. Originally the company intended to go around Cumberland, behind the town of Wills Creek, but complaints from the citizens and the city caused the board to change their plans, and then went into center of Cumberland. The canal was opened for trade to Cumberland on Thursday, October 10, 1850.

By the time the canal reached Cumberland in 1850, it had already been rendered obsolete; the B&O Railroad had reached Cumberland eight years previously. Debt-ridden, the company dropped its plan to continue construction of the next 180 miles (290 km) of the canal into the Ohio Valley.

Map of planned route.

The planned C&O Canal route to navigable waters of the Mississippi watershed would have followed the North Branch Potomac River west from Cumberland to the Savage River. Via the Savage, the canal would have crossed the Eastern Continental Divide at the gap between the Savage and Backbone Mountains near where present day O'Brien Road intersects Maryland Route 495, then via the valley of present day Deep Creek Lake, followed the Youghiogheny River to navigable waters.^{[citation needed]]]}

Intervening years

The canal had deteriorated significantly during the Civil War, and needed much repair and maintenance. In 1869 the report to the board stated: During the last ten years little or nothing had been done toward repairing and improving lock-houses, culverts, aqueducts, locks, lock-gates and waste weirs of the Company; many of them had become entirely unfit for use and were becoming worthless, rendering it absolutely essential to the requirements of the Company to have them repaired. Nevertheless, much improvement had been done in the years after the war, for instance, replacing dams #4 and #5 by the end of the decade.

The canal company did have a few good years and they managed to pay back some of their bonds. The early 1870's, which Unrau calls the "Golden Years" were particularly good. Yet there were still problems, besides flood damage. By 1872, problems with vessels unfit for navigation became so bad, the company put together a committee to inspect and re-register vessels every year. One example in July 1876 was the leaky Lezan Ragan which was leaking badly when loaded in Cumberland, yet the crew kept her floating by pumping. She hit some abutments of the locks near Great Falls, and finally sank at the opening Lock 15 (at the head of Widewater).

The company also installed a telephone system in the 1870's to aid in communication and coordination (see below for more information and references).

For a brief period in the 1860's and 1870's, the company attempted to prevent boating on Sundays, but due to boatmen breaking padlocks on the lock gates and violent confrontations, the company gave up trying to enforce the rule

While a trip from Cumberland to Georgetown was about 7 days, there were several speed records set, from boat races. The fastest known time from Georgetown to Cumberland for a light boat was 62 hours, set by Raleigh Bender from Sharpsburg. Dent Shupp made it from Cumberland to Williamsport in 35 hours with 128 tons of coal..

Receivership

The disastrous flood of 1889, the canal company went into receivership, whereupon the Baltimore and Ohio railroad gained ownership of the canal, primarily to keep the right of way from falling into the hands of the rival Western Maryland railroad.

This, of course, caused major changes in canal business. In efforts to streamline the business especially after 1902, operations shifted away from independent boatmen owning their own boats, to company owned boats. From boats which had colorful names, with private owners, they became numbered boats, run under a schedule.. During the waning years, the boats had the name "Canal Towage Company" with a number, instead of individual names such as Bertha M. Young or Lezen Ragan.

Flood of 1924

The flood of 1924 caused major damage to the canal. Most of the railroad and canal bridges near Hancock were destroyed, opened a breach in Dam #1, and much damage to the banks and masonry of the canal. Although the railroad did some maintenance ostensibly that the canal could quickly be restored to operation, mainly the Georgetown level (Dam #1 and below) was fixed to supply Georgetown's mills with water for operation.. There was no boating season in 1924, and navigation ceased. Unfortunately, some communities such as Glen Echo and Cumberland already used the canal to dump sewage, and G.L. Nicholson called the canal a "public nuisance" due to the sewage and being a breeding ground for mosquitoes

Flood of 1936

This flood caused even more damage to abandoned canal, destroying lockhouses, levels, and other structures. There were some efforts at restoration, mainly to the Georgetown level so that the factories could have their water supply. Due to inattention of the B&O railroad, the canal became a "magnificent wreck".

Tolls and revenue

Register of waybills in the Cumberland Office, in 1858. Each canal boat had to have a waybill, even if empty, for passage through the canal. Fines were levied for lack of a waybill.

Tolls were charged for cargo on the canal. In 1851, for instance, the toll rates on the Canal were set as follows:

Item	Per ton per mile, For first 20 miles	Per ton per mile thereafter
Coal	¼ cent	¼ cent
Slaughtered hogs, bacon & meat	2 cents	1 cent
Whiskey and spirits, fish fresh & salted	2 cents	1 cent
Salt	1 cent	¾ cent
Fire brick	1 cent	½ cent
Bricks, ice	1 cent	¼ cent
Sand, gravel, clay, earth, paving stones	¼ cent	¼ cent

Tolls varied greatly, and frequently the board adopted new toll rates.

Of course, wily boatmen tried to ship extra things in the boats, not listed on the waybills, to avoid paying tolls. For instance, in 1873, one boat went from Georgetown to Harpers Ferry with 225 hidden sacks of salt, before the company found out

5 and 10 dollar notes, from C&O Canal company

The items transported on the canal varied. In the early days, before completion for instance in 1845, the shipments were as follows :

Item sent downstream	Quantity	Items sent upstream	Quantity
Flour	170,464 barrels	Salted Fish	4,569 barrels
Wheat	299,607 bushels	Salt	1,265 tons
Corn	126,799 bushels	Plaster	4,721 tons
Oats	35,464 bushels	Lumber	820,000 feet, board measure
Mill Offal	38,575 bushels	Potatoes	2,511 bushels
Corn Meal	16,327 bushels	Bricks	118,225 units
Pork	15,250 pounds	Wheat	1,708 bushels
Lumber	508,083 feet, board measure	Oysters	1,351 bushels
Stone	12,060 perches

Business after 1891

After 1891, the canal principally transported coal, and sometimes West Virginia limestone, wood, lumber, sand, and flour, but statistics were only kept for coal In the last few years, the tonnage and tolls for coal were as follows

Year	Coal Tonnage	Tolls collected
1914	171,062	42,236.97
1915	173,997	41,271.46
1916	158,036	38,956.77
1917	151,667	40,545.74
1918	138,087	71,404.43
1919	133,529	47,346.95
1920	127,871	62,102.38
1921	66,477	42,017.33
1922	Unavailable	3,435.18
1923	56,404	31,899.32
1924	Unavailable	1,215.60

Business after 1924

After the flood damage of 1924, the railroad only fixed the part of the canal serving Georgetown, since they sold water to the mills therein, leaving the rest of the canal in disrepair. In 1928-1929 there was some talk of restoring and reopening the canal from Cumberland to Williamsport, but with the onset of the Great Depression, the plans were never realized

Fines

The company levied fines for infractions, such as traveling without a waybill or destruction of canal property such as lock gates or canal masonry. For instance:

• May 30, 1877, Capt. Thomas Fisher fined $10 (about $423 USD in 2012) for passing through lock without waybill
• Oct 22, 1877, R. Cropley's scow, fined $25 for knocking out gate in Lock No. 5 [Brookmont Lock]
• Nov. 12, 1877, Capt. Joseph Little, fined $10 for running into crib at Lock No. 9 [Seven Locks]
• July 4, 1878, Boat John Sherman, fined $62.70 for unloading and raising (note: this was on Independence Day)
• Aug 30, 1878, Steamer Scrivenes, fined $50, Allowing the Bertha M. Young in tow to sink on Level 36 and abandoning her at night without giving notice, causing navigation to be suspended 36 hrs.
• May 5, 1879, Capt. Jacob Hooker fined $40, Running into and breaking gate at Lock No. 40
• Jan 14, 1880, Boat Harry & Ralph, fined $5, Running into gate at Darbey’s Lock (Note: this was in winter, when the canal was usually drained for repairs. One wonders what these guys were doing)
• Jun 12, 1880, G.L. Booth, find $4.40, for pumping.

National park

Work on restoring Lock 16 on the canal in 1939.

In 1938, the abandoned canal was obtained from the B&O by the United States in exchange for a loan from the federal Reconstruction Finance Corporation. The government planned to restore it as a recreation area. By 1940, the first 22 miles (35 km) of the canal were repaired and rewatered, from Georgetown to Violettes lock and returned to operating condition . The first Canal Clipper boat, giving mule driven rides, began in 1941.. It was later replaced by the John Quincy Adams in the 1960's.

The project was halted when the United States entered World War II and resources were needed elsewhere. In 1942, freshets destroyed the rewatered sections of the canal. Yet Arthur E. Demeray pressed that the canal from Dam #1 be restored, to supply water to the Dalecarlia Reservoir in case sabotage or bombing destroyed the normal conduits of water. Since this transformed the canal into a concern of national security, in 1942, the War Production Board approved the work. By 1943, Congress had funded the work, repairs were done, and the National Park Service resumed boat trips in October 1943.

After the war, Congress expressed interest in developing the canal and towpath as a parkway. Because of the flooding from the 1920's to the 1940's, the Army Corps of Engineers proposed buildign 14 dams, that would have permanently inundated 74 miles of towpath, as well as the Monocacy and Antietam aqueducts. Around 1945, the Corps wanted to remove Dam #8, which would destroy any hope of rewatering the canal above Dam #5, as well as put a levee around in the Cumberland area. Much of this was done, with the NPS cooperating with the Corps, since maintaining an operating canal all the way to Cumberland was too expensive, as well as wanting to preserve the western parts of the canal.

The idea of turning the canal over to automobiles was opposed by some, including United States Supreme Court Associate Justice William O. Douglas. In March 1954, Douglas led an eight-day hike of the towpath from Cumberland to D.C. Although 58 people participated in one part of the hike or another, only nine men, including Douglas, hiked the full 184.5 miles (297 km). Popular response to and press coverage of the hike turned the tide against the parkway idea and, on January 8, 1971, the canal was designated a National Historical Park.

C&O Canal monument in Georgetown, Washington, D.C.

Presently the park includes nearly 20,000 acres (80 km²) and receives over 3 million recorded visits each year. Flooding continues to threaten historical structures on the canal and attempts at restoration. The Park Service has re-watered portions of the canal, but the majority of the canal does not have water in it.

Today the park is a popular getaway for Washington residents. The towpath is popular with bikers and joggers. Fishing and boating are popular in the re-watered portions, and whitewater kayakers tackling the world class rapids of the Potomac sometimes use the canal to shuttle upstream. The park offers rides on two reproduction canal boats, the Georgetown and the Charles F. Mercer, (named after the first president of the Canal corporation, and note: this is not the first boat on the canal named Charles F. Mercer.) during the spring, summer and autumn. The boats are pulled by mules, and park rangers in historical dress work the locks and boat while presenting a historical program.

Locks and engineering

Lift Locks and Guard Locks

Main article: Locks on the C&O Canal

To build the canal, the C&O Canal Company utilized a total of 74 lift locks that raised the canal from sea level at Georgetown to 610 feet (190 m) at Cumberland. Eleven stone aqueducts were built to carry the canal over the Potomac's tributaries. In addition, seven dams were built to supply water to the canal, waste weirs to control water flow, and 200 culverts to carry roads and streams underneath the canal. An assortment of lockhouses, bridges, and stop gates were also constructed along the canal's path.

Locks 8-27 and their accompanying lock houses were made from Seneca red sandstone, quarried from the Seneca Quarry, as was Aqueduct No. 1, better known as Seneca Aqueduct. This unique structure is the only aqueduct made from Seneca red sandstone and is doubly unique for being the only aqueduct on the C&O that is also a lock (Lock 24, Riley's Lock).

Seven guard locks, often called inlet locks (numbered 1 through 8) were built to allow water and sometimes boats (particularly at Big Slackwater and Little Slackwater) to enter. Dam #7 and Guard Lock #7 were proposed (near mile 164 at the South Branch of the Potomac) but never built.. In 1856, there was a steam pump put at that site. Later, in 1872, a new steam pump was put near mile 174.

Three additional river locks were built, to allow boats to enter the canal at the river. They were at Goose Creek (below Edwards Ferry, Lock 25), near the Shenendoah River, and at Shepherdstown. After the 1889 flood destroyed the nearby dam, the raison d'être for the Shepherdstown lock was gone, and so it was filled in.

Feeders

There were three streams used as feeders: Rocky Run feeder (section #9, around 7 Locks), Great Falls feeder (section #18) and the Tuscarora feeder (section #78). There was a contemplated feeder at the Monocacy (not built)., as well as other places. Of course, the remains of the Potomac Company Little Falls skirting canal was used as a feeder also.

Slackwater Navigation

Boat at Big Slackwater

Despite Charles F. Mercer, two slackwaters were used for navigation: Big Slackwater at Dam #4, and Little Slackwater at Dam #5. Big Slackwater is about 3 miles long, Little Slackwater is about 1/2 mile long. The boats had to navigate despite winds, currents, and debris in the channel. In February 1837, the board of directors discussed using steam power in the slackwater for the boats, but instead decided on a permanent towpath. The towpath for Big Slackwater was completed in 1838 for $31,416.36, and the towpath for Little Slackwater was completed in 1839 for $8,204.40.

Waste weirs, spillways, and informal overflows

To regulate the level of water in the canal prism, waste weirs, informal overflows, and spillways were used. The informal overflows were a dip in the towpath allowing water to flow over. Many of these, for instance, at Pennyfield lock, were replaced by a waste weir . Waste weirs were originally made of masonry with a boards over them forming a towpath bridge, but were later replaced by concrete structures, as was the one at Pennyfield lock in 1909-1911.

There were a few spillways, which were like informal overflows, but made of concrete and often have a bridge. The longest spillway, near Chain Bridge, is 354 feet long, was made in 1830 (but has been worked on since). Another spillway near Foxhall road at mile 1.51, was made in 1835. The spillway and waste weir at Big Pool was built in the 1840's

Paw Paw tunnel

Paw Paw Tunnel

One of the most impressive engineering features of the canal is the Paw Paw Tunnel, which runs for 3,118 feet (950 m) under a mountain. Built to save six miles (10 km) of construction around the obstacle, the 3/4-mile tunnel used over six million bricks. The tunnel took almost twelve years to build; in the end, the tunnel was only wide enough for single lane traffic. One notorious incident included two captains who refused to budge for several days. The company official threw green cornstalks onto a roaring fire at the upwind portion of the tunnel, smoking the offenders out.

Inclined Plane

Remains of the inclined plane

Starting in 1875, a canal inclined plane was built two miles (3 km) upriver from Georgetown, so that boats whose destination was downriver from Washington could bypass the congestion (and price gouging of independent wharf owners) in Georgetown. Originally the company planned to build a river lock, but then discovered that such a lock occasionally would consume more water than the level could provide. They then planned to make an inclined plane, much like the Morris Canal. The inclined plane was dismantled after a major flood in 1889 when ownership of the canal transferred to the B&O Railroad, which operated the canal to prevent its right of way (particularly at Point of Rocks) from falling into the hands of the Western Maryland Railway..

Telephone System

In the late 1870's, the Company installed a telephone system, rather than a telegraph as was the railroad practice, for $15,000. Completed in October of 1879, it had 43 stations along the canal. It was divided into sections with three switches, placed respectively at Dam #4, Dam #6, and Wood's Lock (head of 9 Mile level, i.e. Lock 26). It is unknown if there are currently any remains of this system.

Culverts

Culvert #30 lets Muddy Branch under the canal

To carry small streams under the canal, small culverts, usually of masonry, were built. For instance, culvert #30 was built in 1835 to carry Muddy Branch under the canal. Unfortunately culverts are prone to collapse due to tree roots growing into the canal prism; in addition, rubbish from floods plug culverts, causing floods and more damage.

Aqueducts

Eleven aqueducts carried the canal over rivers and large streams, where they were too large for a culvert.

No.	Miles	Name	Coordinates	Date	Photo
1	23	Seneca Aqueduct (Riley's Lock)	39.068772°N 77.34108°W / 39.068772; -77.34108	Apr 1832
2	42.2	Monocacy Aqueduct	39.223926°N 77.4521182°W / 39.223926; -77.4521182	May 1833
3	51.5	Catoctin Aqueduct	39.310996°N 77.568562°W / 39.310996; -77.568562	Feb 1834
4	69.36	Antietam Aqueduct	39.417476°N 77.745807°W / 39.417476; -77.745807	Apr 1835
5	99.80	Conococheague Aqueduct	39.601337°N 77.827951°W / 39.601337; -77.827951	Nov 1835
6	116.4	Licking Creek Aqueduct		May 1938
7	122.96	Tonoloway Aqueduct	39.693938°N 78.156535°W / 39.693938; -78.156535	June 1839
8	136.5	Sideling Hill Creek Aqueduct		Spring 1850
9	140.9	Fifteen Mile Creek Aqueduct		Summer 1850
10	162.3	Town Creek Aqueduct		Summer 1850
11	180.7	Evitts Creek Aqueduct		Spring 1850

Boats on the Canal

The following classifications of boats originally defined for the canal were as follows:

• Packet Boats, for passengers
• Freight boats
• Scows, especially work scows for construction and maintenance, as well as ice breaking
• Gondolas

Rafts were, from time to time, on the canal, as well as launches and canoes.

During the Civil war, the canal company attempted to keep the canal open during the winters of 1861-1862, despite the fact that winters were usually for repairs. Icebreaker boats were used to keep the channel free of ice, so that the military could move supplies.. Even after that, icebreakers were used on the canal, for instance, at the end of the boating season when winter froze the canal, so that the last group of boats could go home. The icebreaker was typically a company scow filled with pig iron. Mules would pull the boat onto the ice, and the weight would break the ice.

Classifications were to change. In 1851, the classes were A, B, C, D, E, and F, depending on dimensions and tonnage

A steamboat on the C&O Canal. Note the steering wheel and the smokestack on this boat

There were occasionally steam boats, one being authorized in 1824 In 1850, the N S Denny company operated some steam driven tugboats on the Canal .

During the declining years, freight boats were generally made in Cumberland .

Points of interest

• East of Mile 000: Lock Keeper's House at eastern end of Washington Branch of C&O Canal.38°52′13.64″N 77°0′55.68″W
• Mile 000: Tidewater Lock
• Mile 000: Rock Creek Park38°57′10″N 77°2′30″W
• Mile 000: C&O Canal Monument
• Mile 000: Lock 138°54′13.55″N 77°3′25.92″W
• Mile 000: Georgetown, Washington, D.C. 38°53′59″N 77°3′27.5″W and Georgetown Visitor Center

38°54′14.5″N 77°3′31″W

• Mile 000: Potomac Heritage Trail - on Virginia side of river. (Bikes can use it below Francis Scott Key Bridge.)
• Mile 001: Abutment and former canal bed of Potomac Aqueduct Bridge
• Mile 001: Capital Crescent Trail
• Mile 002: Inclined Plane
• Mile 005.4: Lock 6 where C&O groundbreaking took place on July 4, 1828
• Mile 007: Glen Echo Park (Maryland) and Lock 7 38°57′52″N 77°8′20″W
• Mile 008.4: Lock 8, the first of the "Seven Locks" and the Potomac Conservancy's River Center
• Mile 014: Billy Goat Trail at Great Falls, Great Falls Tavern 39°0′1″N 77°14′54″W
• Mile 016: Swain's Lock at Lock 21, Potomac, Md
• Mile 020: Pennyfield Lock 39°3′13.6″N 77°17′20″W
• Mile 022: Violette’s Lock (Lock 23) The canal has water in it from here south. 39°4′1″N 77°19′43″W
• Mile 022.7: Seneca Aqueduct/Riley's Lock 39°4′7.5″N 77°20′27″W
• Mile 023: Seneca Quarry
• Mile 026: Dierssen Wildlife Management Area & McKee-Beshers Wildlife Management Area
• Mile 035: Poolesville, Maryland
• Mile 035: White's Ferry 39°9′17″N 77°31′2″W
• Mile 042: Monocacy Aqueduct 39°13′25″N 77°27′7″W
• Mile 044.6: Noland's Ferry
• Mile 048: Point of Rocks, Maryland 39°16′25″N 77°32′30″W
• Mile 055: Brunswick, Maryland 39°18′41″N 77°37′50″W
• Mile 058: Appalachian Trail
• Mile 060: Harpers Ferry, West Virginia 39°19′31″N 77°44′36″W
• Mile 069.4: Antietam Creek Aqueduct
• Mile 073: Ferry Hill, Maryland
• Mile 073: Shepherdstown, West Virginia39°25′55″N 77°48′22″W
• Mile 073: Sharpsburg, Maryland 39°27′28″N 77°44′58″W
• Mile 099: Williamsport, Maryland39°35′55″N 77°49′6″W
• Mile 107: Dam No. 539°36′22″N 77°55′23″W
• Mile 110: Four Locks - Once a thriving community of homes and businesses supporting the canal.
• Mile 110.4: McCoy's Ferry - Campground and historic American Civil War crossing
• Mile 112: Fort Frederick State Park; Western Maryland Rail Trail begins
• Mile 124: Hancock, Maryland
• Mile 124: Rt. 522 Bridge to Berkeley Springs, West Virginia; Western Maryland Rail Trail diverges
• Mile 140: Little Orleans, Maryland
• Mile 151: Paw Paw Tunnel - The path into the tunnel from the east been reopened in May 2013.
• Mile 151: Paw Paw, West Virginia
• Mile 165: Oldtown, Maryland
• Mile 184: Cumberland, Maryland
• Mile 184: Canal Place
• Mile 184: Western Maryland Scenic Railroad

See also

• List of canals in the United States
• Locks on the C&O Canal
• Tidewater Lock
• Canal Place, Cumberland

General references

• Camagna, Dorothy (2006). The C&O Canal: From Great National Project to National Historical Park. Gaithersburg, Maryland: Belshore Publications. ISBN 0-9770449-0-4. 
• Hahn, Thomas (1984). The Chesapeake & Ohio Canal: Pathway to the Nation's Capital. Metuchen, New Jersey: The Scarecrow Press, Inc. ISBN 0-8108-1732-2. 
• Mackintosh, Barry (1991). C&O Canal: The Making of A Park. Washington, D.C.: National Park Service, Department of the Interior. 
• National Park Service (2006-08-08). "C&O Canal Educational Programs: Lessons Page". United States Department of the Interior. Retrieved 2008-06-02. 

Further reading

• Life on the Chesapeake & Ohio Canal, 1859 [York, Pa. : American Canal and Transportation Center, 1975]
• Achenbach, Joel. The Grand Idea: George Washington's Potomac and the Race to the West, Simon and Schuster, 2004.
• Blackford, John, 1771-1839. Ferry Hill Plantation journal: life on the Potomac River and the Chesapeake and Ohio Canal, 4 January 1838-15 January 1839 2d ed. Shepherdstown, W. Va. : [American Canal and Transportation Center], 1975.
• Cotton, Robert. The Chesapeake and Ohio Canal Through the Lens of Sir Robert Cotton
• Fradin, Morris. Hey-ey-ey, lock! Cabin John, Md., See-and-Know Press, 1974
• Gutheim, Frederick. The Potomac. New York: Rinehart and Co., 1949.
• Guzy, Dan. Navigation on the Upper Potomac and Its Tributaries. Western Maryland Regional Library, 2011
• Hahn, Thomas F. The Chesapeake and Ohio Canal Lock-Houses and Lock-Keepers.
• Hahn, Thomas F. Towpath Guide to the C&O Canal: Georgetown Tidelock to Cumberland. Shepherdstown, WV: American Canal and Transportation Center, 1985.
• High, Mike. The C&O Canal Companion, Johns Hopkins University Press, 2001.
• Kapsch, Robert and Kapsch, Elizabeth Perry. Monocacy Aqueduct on the Chesapeake and Ohio Canal. Medley Press, 2005.
• Kapsch, Robert. The Potomac Canal, George Washington and the Waterway West.Morgantown, WV: West Virginia University Press, 2007.
• Kytle, Elizabeth. Home on the Canal, Cabin John, Md.: Seven Locks Press, c. 1983.
• Martin, Edwin. A Beginner's Guide to Wildflowers of the C and O Towpath, 1984.
• Mulligan, Kate. Canal Parks, Museums and Characters of the Mid-Atlantic, Wakefield Press, Washington, DC, 1999.
• Mulligan, Kate. Towns along the Towpath, 1997. (Available from C &O Association) Here is Chapter 3 about Seneca.
• National Park Service, Chesapeake and Ohio Canal National Historical Park Washington, DC: NPS Division of Publications, 1991.
• Rada, James Jr. Canawlers, Legacy Press, 2001.

• Southworth, Scott, et al. Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia: U.S. Geological Survey Professional Paper 1691, 2008.

External links

• Official National Park Service Site
• The Building of the Chesapeake and Ohio Canal, a National Park Service Teaching with Historic Places (TwHP) lesson plan
• Jack Rottier photographs and papers of the C and O Canal Online Collection, Special Collections Research Center, Estelle and Melvin Gelman Library, The George Washington University.
• Everything About The C&O Canal
• The Chesapeake and Ohio Canal
• C&O Canal Bicycling Guide
• A Virtual Tour of the C&O Canal
• Another Virtual Tour of the C&O Canal
• C&O Canal Association
• The economic impact of the C&O Canal on canal communities in Washington County, Maryland
• Thomas Hahn Chesapeake and Ohio Canal Collection Finding Aid, Special Collections Research Center, Estelle and Melvin Gelman Library, The George Washington University
• The Chesapeake and Ohio Canal Documentary produced by WETA-TV