Canal Prism - Shape of the Canal

Empty canal prism at Great Falls Historic photo of a canal boat being pulled down the canal

Right Side: Canal Boat Pulled by Mules
NPS

Left Side: Empty canal prism in Great Falls
NPS/ E. Cowan

 

America's Canal Dream

Back when George Washington was the President of the Potowmack Canal Company he supported short skirting canals around unnavigable parts of the Potomac River. These canals made 218 miles of the river navigable when the conditions were right. Ironically, the Potomac River itself was the reason why the skirting canals didn't work out. Often times the river didn't provide a reliable water level needed to operate the Lift Locks safely, which made using these skirting canals unreliable and even dangerous.

Learn more about George Washington's influence on the C&O Canal:
George Washington - Chesapeake & Ohio Canal National Historical Park (U.S. National Park Service) (nps.gov)

Learn more about the Potowmack Canal Company:
Potowmack Company Canal and Locks (U.S. National Park Service)(npshistory)

Illustration of the construction of the C&O canal prism Illustration of constructing the C&O Canal
NPS/ Harpers Ferry Center

The start of the C&O Canal Company

During the early 1820's, Virginia and Maryland sought for the establishment of a new canal company which would unite the Potomac and the Ohio by means of a continuous canal. As early as 1820 the State of Virginia authorized its Board of Public Works to conduct surveys of the land between the Potomac and the southern branches of the Ohio for a possible continuous canal to connect the two rivers. In his report of the first survey, Thomas Moore, the Civil Engineer of Virginia, confirmed the opinion that such a 2 connection was practicable and estimated its cost at about $1,114,300.

In 1820, the Potowmack Canal Company transferred their rights to the Chesapeake and Ohio Canal Company. The C&O Canal Company planned to undertake this challenge of creating a continous canal. Their plan to overcome the Potomac River was to dam up the river in multiple sections to ensure there would be a supply of water for the canal to rely upon.

Upon hearing Thomas Moore's report, the movement for a continuous canal gathered momentum. President James Monroe and Congress endorsed the project by providing $30,000 for a detailed survey of the proposed route. The United States Board of Engineers made a preliminary report on February 14, 1825. This new report untimately secured that this project would be an ultimate success. Congress shortly thereafter chartered the canal company in a measure approved by President Monroe on March 3, 1825.

Empowered about thier promising future, the C&O Canal Company was eager to accept subscriptions for the purpose of financing the construction of an artifical waterway. The route beginning in the District of Columbia to the highest point of permanent navigation on the Ohio River at Pittsburgh, PA. 100 miles of the canal were to be completed and put into use within 5 years, and the entire project was to be completed in 12 years.

While supporters of the project promptly plunged into the campaign for public support, a full report of the Board of Engineers issued in 1836, dealt a temporary set back.The report agreed that the project was practicable, but estimated the project cost based on its proposed enlarged dimensions at $22,375,429.69.

Illustration John Quincy Adams performing the Groundbreaking for the C&O Canal Groundbreaking ceremony for the C&O Canal
NPS/ Harpers Ferry Center

This new estimate alarmed Congress and requested John Qunicy Adams to submit the conflicting estimates made by the state engineers and Board of Engineers to a review by experienced canal builders. The President appointed James Geddes and Nathan Roberts, both of whom had worked on the Erie Canal in New York. They hurried surveyed the eastern section of the proposed canal route from Georgetown to Cumberland, and estimated the cost of construction at slightly more than $4,000,000, which was about half the Board's estimates for the same section. Geddes and Roberts made three estimates and the third estimate recieved a great deal of attention. They called for an enlarged canal trunk, "where practicable by cormnon excavation, to 60 feet at the surface, with a proportionate breadth at the bottom, which is computed to be 42 feet; and 5 feet depth of water."

The C&O Canal Groundbreaking

Heartened by the reduced estimates of Geddes and Roberts, the canal supporters were successful in urging Congress to pass an act subscribing $1,000,000 of the public funds to the stock of the Chesapeake and Ohio Canal Company.On July 4, 1828, ceremonies marking the formal inauguration of the canal project were held at the Powder Magazine near the head of Little Falls where President John Quincy Adams dug the first spadeful of earth from the canal. This affair, held on the 52d anniversary of American independence, was highly successful and focused national attention on the canal project, and the canal's sponsors confidently expected that it would soon be carrying a heavy volume of commerce between the Potomac and the Ohio River valleys.

 

Building the C&O Canal

The C&O Canal Company and those involved had high hopes for success, but many unaccounted for  factors resulted in the canal's closure just under a 100 years later. What happened?

Last updated: December 16, 2023

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