Which year did the Mississippi River become more channelized? when they blasted it with dynamite to shorten it?

Q.

A. The chief river of the United States, rising in the lake region of northern Minnesota and flowing about 3,781 km (2,350 mi) generally southward to enter the Gulf of Mexico through a huge delta in southeast Louisiana. Probably discovered by Hernando de Soto in 1541, it was explored by Jacques Marquette and Louis Jolliet in 1673. La Salle claimed the entire region for France after he descended to the river's mouth in 1682.

20th century
In the spring of 1927, the river broke out of its banks in 145 places during the Great Mississippi Flood of 1927 and inundated 27,000 sq mi (70,000 km²) to a depth of up to 30 ft (10 m).

On October 20, 1976, the automobile ferry MV George Prince was struck by a ship traveling upstream as the ferry attempted to cross from Destrehan, Louisiana, to Luling, Louisiana. Seventy-eight passengers and crew died, only eighteen survived the accident.

In 1988, record low water levels provided an opportunity and obligation to examine the climax of the wooden-hulled age. The Mississippi fell to 10 feet (3.0 m) below zero on the Memphis gauge. Four and a half acres of water craft remains were exposed on the bottom of the Mississippi River at West Memphis, Arkansas. They dated to the late 19th to early 20th centuries. The State of Arkansas, the Arkansas Archeological Survey, and the Arkansas Archeological Society responded with a two-month data recovery effort. The fieldwork received national media attention as good news in the middle of a drought.

The Great Flood of 1993 was another significant flood, primarily affecting the Mississippi above its confluence with the Ohio River at Cairo, Illinois.
Two portions of the Mississippi were designated as American Heritage Rivers in 1997: the lower portion around Louisiana and Tennessee, and the upper portion around Iowa, Illinois, Minnesota and Missouri.

21st century

Campsite at the river in ArkansasIn 2002, Slovenian long-distance swimmer Martin Strel swam the entire length of the river, from Minnesota to Louisiana, over the course of 68 days.
In 2005, the Source to Sea Expedition (http://sourcetosea.net) paddled the Mississippi and Atchafalaya rivers to benefit the Audubon Society's Upper Mississippi River Campaign.[15][16]
On August 1, 2007, the I-35W Mississippi River bridge in Minneapolis collapsed during the evening rush hour.
Also in 2007, it is expected that more than 150 pleasure boats will travel down the river from Grafton to Cairo while participating in the Great loop, which is circumnavigation of Eastern North America by water.




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