The Mississippi River is the primary river, and second-longest river, of the largest drainage basin in the United States. From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for 2,340 miles (3,766 km) to the Mississippi River Delta in the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 32 U.S. states and two Canadian provinces between the Rocky and Appalachian mountains. The main stem is entirely within the United States; the total drainage basin is 1,151,000 sq mi (2,980,000 km2), of which only about one percent is in Canada. The Mississippi ranks as the thirteenth-largest river by discharge in the world. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.
The Missouri River is the longest river in the United States. Rising in the Eastern Centennial Mountains of the Bitteroot Range of the Rocky Mountains of Southwestern Montana, the Missouri flows east and south for 2,341 miles (3,767 km) before entering the Mississippi River north of St. Louis, Missouri. The river drains a sparsely populated, semi-arid watershed of more than 500,000 square miles (1,300,000 km2), which includes parts of ten U.S. states and two Canadian provinces. Although a tributary of the Mississippi, the Missouri River is slightly longer and carries a comparable volume of water. When combined with the lower Mississippi River, it forms the world's fourth longest river system.
The United States Army Corps of Engineers (USACE) is an engineer formation of the United States Army that has three primary mission areas: Engineer Regiment, military construction, and civil works. The day-to-day activities of the three mission areas are administered by a lieutenant general known as the commanding general/chief of engineers. The chief of engineers commands the Engineer Regiment, comprising combat engineer, rescue, construction, dive, and other specialty units, and answers directly to the Chief of Staff of the Army. Combat engineers, sometimes called sappers, form an integral part of the Army's combined arms team and are found in all Army service components: Regular Army, National Guard, and Army Reserve. Their duties are to breach obstacles; construct fighting positions, fixed/floating bridges, and obstacles and defensive positions; place and detonate explosives; conduct route clearance operations; emplace and detect landmines; and fight as provisional infantry when required. For the military construction mission, the commanding general is directed and supervised by the Assistant Secretary of the Army for installations, environment, and energy, whom the President appoints and the Senate confirms. Military construction relates to construction on military bases and worldwide installations.
The Pearl River is a river in the U.S. states of Mississippi and Louisiana. It forms in Neshoba County, Mississippi from the confluence of Nanih Waiya and Tallahaga creeks, and has a meander length of 444 miles (715 km). The lower part of the river forms part of the boundary between Mississippi and Louisiana.
The Lower Mississippi River is the portion of the Mississippi River downstream of Cairo, Illinois. From the confluence of the Ohio River and Upper Mississippi River at Cairo, the Lower flows just under 1000 miles (1600 km) to the Gulf of Mexico. It is the most heavily travelled component of the Mississippi River System.
The Waterways Experiment Station (WES) in Vicksburg, Mississippi, is a United States Army Corps of Engineers research campus. The 673-acre (272 ha) campus hosts the headquarters of the Engineer Research and Development Center (ERDC) and four of its seven laboratories. Congress authorized the research complex in 1929 to develop flood control methods on the Mississippi River, as part of the Mississippi River and Tributaries Project. Subsequent research delved into topics, including coastal engineering, dredging, weapons effects, and geotechnical engineering.
The Water Resources Development Act of 1986 is part of Pub. L.Tooltip Public Law 99–662, a series of acts enacted by Congress of the United States on November 17, 1986.
The Water Resources Development Act of 1996 is part of Pub. L.Tooltip Public Law 104–303 (text)(PDF), was enacted by Congress of the United States on October 12, 1996. Most of the provisions of WRDA 1996 are administered by the United States Army Corps of Engineers.
Water Resources Development Act of 1976,, Pub. L.Tooltip Public Law 94–587 is a public law enacted on October 22, 1976, by the Congress of the United States of America concerning various water resources and projects.
Water Resources Development Act of 1988, Pub. L.Tooltip Public Law 100–676, is a public law passed by Congress on November 17, 1988 concerning water resources in the United States in the areas of flood control, navigation, dredging, environment, recreation, water supply, beach nourishment and erosion.
The Water Resources Development Act of 1992, Pub. L.Tooltip Public Law 102–580, was enacted by Congress of the United States on October 31, 1992. Most of the provisions of WRDA 1992 are administered by the United States Army Corps of Engineers.
The Water Resources Development Act of 1999, Pub. L.Tooltip Public Law 106–53 (text)(PDF), was enacted by Congress of the United States on August 17, 1999. Most of the provisions of WRDA 1999 are administered by the United States Army Corps of Engineers.
The Water Resources Development Act of 2000, Pub. L.Tooltip Public Law 106–541 (text)(PDF), was enacted by Congress of the United States on December 11, 2000. Most of the provisions of WRDA 2000 are administered by the United States Army Corps of Engineers.
M/V Mississippi is a United States Army Corps of Engineers (USACE) towboat operating on the Mississippi River. It is the largest diesel towboat on the river.
The Flood Control Act of 1928 authorized the U.S. Army Corps of Engineers to design and construct projects for the control of floods on the Mississippi River and its tributaries as well as the Sacramento River in California. It was sponsored by Sen. Wesley L. Jones (R) of Washington and Rep. Frank R. Reid (R) of Illinois, in response to the Great Mississippi Flood of 1927.
Major floods along the Mississippi River in April and May 2011 were among the largest and most damaging recorded along the U.S. waterway in the past century, comparable in extent to the Great Mississippi Flood of 1927 and Great Flood of 1993. In April 2011, two large storm systems deposited record levels of rainfall on the Mississippi River drainage basin. When that additional water combined with the springtime snowmelt, the river and many of its tributaries began to swell to record levels by the beginning of May. Flooding occurred in Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana.
The project design flood is a hypothetical "maximum probable" flood of the Mississippi River used by the United States Army Corps of Engineers to aid in the design and execution of flood protection in the Mississippi Valley.
The Jefferson Seaway was a proposed deep-draft ship channel to be created in Jefferson Parish, Louisiana, that would establish a route between the Mississippi River at Westwego and the Gulf of Mexico near Grand Isle. The Mississippi River provided the only deep-water access to New Orleans and its neighboring ports. In the mid-20th century, the creation of alternate routes was considered, including the Mississippi River-Gulf Outlet (MR-GO), which was ultimately selected, funded and constructed. The Jefferson Seaway, sometimes referred to as the Arrow to the Americas, the Mississippi Valley Seaway Canal, the Tidewater Ship Canal and the Barataria Canal, was also under consideration but ultimately was never constructed as a deep-draft channel.
Flooding in the Mississippi River Basin during the winter, spring, and summer of 2019 caused at least 12 deaths and economic losses in 19 states totaling in excess of $20 billion. Estimated damages in the Midwestern United States alone had reached $12.5 billion by April 2019. Flood damages totaling $6.2 billion were reported in the 11 states bordering the Mississippi River. In addition to property and crop losses and infrastructure damages, commercial navigation on the Mississippi River was interrupted repeatedly by high currents, low bridge clearances, and closed locks. This delayed shipments of agricultural commodities, adding to the economic stress of crop losses caused by flooding. As of late April 2019, shipments of corn to export terminals in Louisiana were 31% lower than in same period in 2018.
