Definition: Structures, typically of metal, wood, or stone, that span a river or other waterway
Significance: Bridges are important to commerce in that they permit travel by roadway over otherwise impassable bodies of water, thus making trading easier and faster. Some of the earliest American corporations formed to create bridges.
Since ancient times, human societies have built bridges across waterways, particularly narrow bodies of water such as streams. As local economies increasingly became regional and national economies, the need for bridges increased. At first, ferryboats were used to transport individuals across streams. As the level of trade increased, however, the loads became too large for the boats to handle efficiently, and the cost of making multiple trips by ferryboat resulted in high prices for the goods being ferried. Bridges began to present an economical alternative. In some cases, owners of ferryboats built toll bridges to replace their own ferry services. Early bridges were built of wood, but iron and steel became the materials of choice during the late nineteenth century, particularly for larger bridges.
When the young American states began chartering corporations shortly after the end of the Revolutionary War, private enterprises constructing and running toll bridges were among the first to be incorporated in each state. Bridges were not yet considered to be a public good that would be provided by the government, so their construction had to be financed privately. As the country spread westward, additional states joined the union, and their legislatures also saw fit to permit entrepreneurs to construct toll bridges. As a result, toll bridges were among the first corporations to be chartered in the eastern and midwestern states. The only corporations to predate toll bridges were canal builders and financial institutions. Even toll roads were not chartered as corporations until after toll bridges were incorporated. In fact, some experts speculate that entrepreneurs were inspired to build toll roads only after it became evident that toll bridges were so successful.
- Ambrose, Stephen E. Nothing Like It in the World. New York: Simon & Schuster, 2000. Discusses the role of bridge building for the Transcontinental Railroad and includes several photos of the building process.
- Davis, Joseph Stancliffe. Essays in the Earlier History of American Corporations. Cambridge, Mass.: Harvard University, 1917. A collection of essays on various types of early corporations, including toll bridges.
- Dilts, James D. The Great Road. Stanford, Calif.: Stanford University Press, 1993. An excellent history of the Baltimore and Ohio Railroad, including extensive discussion of railroad bridges.
- Jackson, Robert W. Rails Across the Mississippi: A History of the St. Louis Bridge. Urbana: University of Illinois Press, 2001. An excellent history of the Eads Bridge over the Mississippi River that was started in 1867.
- Schuyler, Hamilton. The Roeblings: A Century of Engineers, Bridge-Builders and Industrialists. Princeton, N.J.: Princeton University Press, 1931. History of three generations of a family of bridge builders.
- Toll Facilities in the United States: Bridges, Roads, Tunnels, Ferries. Washington, D.C.: U.S. Department of Transportation, 1995. An overview of all modern toll facilities in the United States, including bridges.