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Bayou Teche (Louisiana French: Bayou Têche) is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map , accessed June 20, 2011 waterway in south central Louisiana in the United States. Bayou Teche was the Mississippi River's main course when it developed a delta about 2,800 to 4,500 years ago. Through a natural process known as deltaic switching, the river's deposits of silt and sediment cause the Mississippi to change its course every thousand years or so.
During the American Civil War, there were two naval engagements on Bayou Teche. The Confederate navy had a gunboat on the bayou, the , which was partially armored with railroad iron. On November 3, 1862, four Union gunboats, , , , and , moved up the Bayou to engage the Cotton. All four Union ships were damaged, but the Cotton was forced to withdraw.
The second engagement occurred on 14 January 1863. Union general Godfrey Weitzel learned that the J. A. Cotton was planning an attack on Weitzel's forces at Berwick Bay, Louisiana. Once again Kinsman, Calhoun, Estrella and Diana steamed into the Bayou, followed by Union transports. The bayou had been obstructed with debris. The Union gunboats and land-based units engaged the J. A. Cotton and Confederate infantry in rifle pits. During the battle Kinsman hit a mine and unshipped her rudder; the J. A. Cotton was badly damaged, and her crew set her on fire during the night to prevent capture. The Union, however, was unable to hold the Teche, necessitating two more invasions of the Teche country in 1863 and 1864, referred to as the Bayou Teche campaign.
After the levees were built along the Atachafalaya River in the 1930s, the Teche and the rice farms located along the bayou suffered a drastic reduction in fresh water. Between 1976 and 1982, the United States Army Corps of Engineers built a pumping station at Krotz Springs to pump water from the Atchafalaya River into Bayou Courtableau.
The etymology of the name "Teche" is uncertain. One hypothesis is that it comes from "tenche", a Chitimacha Indian word meaning "snake", related to the bayou's twists and turns resembling a snake's movement. The Chitimacha tell an ancient story of how the snake attacked their villages, and it took many warriors many years to kill it. Where the huge carcass lay and decomposed, the depression it left behind filled with water to become the bayou. Alternatively, George R. Stewart asserts that it is "probably a French rendering of Deutsch, the name by which the German colonists of the area would have named their stream. Cf. Germans 'German'."George R. Stewart American Place-names (New York: Oxford University Press, 1970), p. 475.
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