Saltwater Lake Pontchartrain

Lake Pontchartrain is a brackish lake located in southeastern Louisiana. It is the second-largest saltwater lake in the United States, after the Great Salt Lake in Utah, and the largest lake in Louisiana. It covers an area of 630 square miles (1630 square km) with an average depth of 12 to 14 feet (about 4 meters). Some shipping channels are kept deeper through dredging. It is roughly oval in shape, about 40 miles (64 km) wide and 24 miles (39 km) from south to north.

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The south shore forms the northern boundary of the city of New Orleans, and its two largest suburbs Metairie and Kenner. On the north shore of Lake Pontchartrain is an area called the North Shore or Northshore or the Northlake area. It is composed of cities such as Mandeville, Covington, Madisonville, Slidell; in Saint Tammany Parish; Ponchatoula, Hammond, and Amite in Tangipahoa Parish; and Franklinton and Bogalusa in Washington Parish. These Northshore parishes form the eastern Florida Parishes.

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Lake Pontchartrain is named for Louis Phélypeaux, comte de Pontchartrain, the French Minister of the Marine, chancellor of France and minister of finance during the reign of France's "Sun King," Louis XIV, for whom Louisiana is named.

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The lake was created 2,600 to 4,000 years ago as the evolving Mississippi River Delta formed its southern and eastern shorelines with alluvial deposits. Its Native American name was Okwata ("Wide Water"). In 1699, French explorer Pierre Le Moyne d'Iberville renamed it Pontchartrain after Louis Phélypeaux, comte de Pontchartrain.

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Human habitation of the region began at least 3,500 years ago, but increased rapidly with the arrival of Europeans about 300 years ago. The current population is over 1.5 million. The United States Geological Survey is monitoring the environmental effects of shoreline erosion, loss of wetlands, pollution from urban areas and agriculture, saltwater intrusion from artificial waterways, dredging, basin subsidence and faulting, storms and sea-level rise, and freshwater diversion from the Mississippi and other rivers.

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