
Map
A geological feature of Florida is the Great Sandy Ridge that extends down the center of the state. There is no natural water way that crosses the ridge allowing east-west travel across the state by river. Rivers to the east of the Florida ridge, like the St. Johns, flow into the Atlantic while rivers to the west, like the Santa Fe, flow into the Gulf of Mexico. With the success of the Erie Canal, men envisioned repeating that success with a canal across Florida cutting the weeks long trip around the southern tip of Florida to a few days. Such a canal would connect the rivers in the east to the rivers in the west.
Several northern canals routes were proposed connecting the Suwannee to the St. Mary’s or to the St. Johns. One such canal connected the Suwannee and St. Johns by the way of the Santa Fe River in the west and the Black River in the east. It wasn’t clear what the canal barges would have done when they reached the natural bridge on the Santa Fe. A more southern route was proposed as being the most practical, connecting the Amaxura River on the Gulf to the Ocklawaha on the west which flows into the St. Johns.
There was a question of how to pay for such a canal with passenger travel between the only two significant cities in the Gulf being Pensacola and New Orleans would not be enough. Transportation of goods would help but the key was to sell the idea to the military as being of importance in war and let the military build and pay for it. The Pensacola Gazette provided a summary in 1825.
February 16, 1825, Pensacola Gazette, page 1
Canals
Your memorialists consider as another object of pecuniary importance, the opening of a canal across the peninsular of East Florida from the River Suwaney to St. John’s or between such other points as on examination may prove to be more eligible. Such a canal by opening a passage from the Gulf of Mexico to the Atlantic, would in an eminent degree develop the agricultural resources of Florida, enhance the value of the public lands, promote the intercourse and enlarge the commerce of the Atlantic & Western States, and in time of war would give celerity and energy to the operations of the General Government, and it is believed that in no part of the United States could an object of so much public utility be promoted with less difficulty or expenditure; the peninsula being intersected at various parts by water courses, the connection of which would render the expense of this work an object of comparative insignificance.
There is, however, another and most important canal required in that rich and most valuable, but neglected Territory, Florida. A canal to unite the waters of the Gulf of Mexico with the Atlantic, beginning at Vacassar Bay in the Gulf, and terminating in the St. John’s River, or at St. Mary’s.
The distance across the isthmus is about miles, and from Vignole’s[1] map, now before us, there are two routes for the canal, one of which will require only eighteen miles of canal, and the other about twelve miles. The first and most approved route commences in Vacassar Bay, which is bold and spacious, and affording a good harbor and anchorage. In this Bay the river Suwanee empties, in which the navigation can be freely pursued until it branches into the Santa Fe – from thence into Orange Lake, across the Alachua Tract into Orange Creek; from thence into the Ocklawaha and St. Johns.
The distance of canalling, or rather in uniting the above navigable rivers by the foregoing route, is said to be but twelve miles. The other route commences at the Anclote Keys, in the Gulf, and enters the Amaxura River; from thence into the Ocklawaha, into the St. Johns; distance about eighteen miles of canalling. The first route is most circuitous, but it commences in a fine safe bay, and goes through a richer tract of country – the St. John’s river is a plain bold river, from the Alachua Ferry.
Let us for a moment contemplate the importance and value of this simple and facile project.
From St. Mary’s or Amelia Island to the Tortugas, the distance cannot be less than 450 or 500 miles, and after having doubled the Florida Keys, it is nearly the same distance to Vacassar Bay. A navigation, therefore, of nearly 800 miles, always the most difficult and dangerous, is avoided by a short canal of 12 miles across Florida; and, by thus uniting the rivers of that country, the trade is brought to St. Mary’s or Amelia Island, where ships of any draught of water can repair. The cotton, sugar, and other produces of Louisians and Alabama, have a short and safe navigation in the Gulf of Mexico into Vacassar Bay, and in three days are transported by canal boats to the mouth of the St. John’s river, or St. Mary’s where vessels are waiting.
It will immediately strike every person interested, as one of the most easy, cheap, and advantageous projects every attempted – it will shorten the voyage to New Orleans – it will curtail the dangers of navigation, and be a protection against Pirates – it will greatly … value and importance of Florida, and the attention of Government should be immediately directed to that quarter and to that project.
[1] Charles Blacker Vignoles, was born Ireland and after arriving in America, became an assistant to the state civil engineer at Charleston in South Carolina. In 1821 he became the city surveyor for St Augustine, Florida, which was slowly being developed. In 1823 he published a map of Florida. [link]
Florida wasn’t then only state considering such a canal. In June of 1825 the Georgia Legislature passed a resolution to survey a canal route from the St. Mary’s to the Suwanee and considerable discussion in the papers about the benefit of such a canal but it was never built.

1878 map of proposed canal from St. Marys River to Gulf of Mexico
In 1878 the U.S. Engineering Corps put forth a proposal for a canal from the St Mary’s River to the Gulf of Mexico but was never built. It was the introduction and spread of the railroad that pretty much put an end to the building of canals in Florida. By 1878 railroads connected Fernanda on the Atlantic to Cedar Key and from Jacksonville to Pensacola in the north.