The Lake Pontchartrain Causeway (French: Chaussée du lac Pontchartrain), also known simply as The Causeway, is a fixed link composed of two parallel bridges crossing Lake Pontchartrain in southeastern Louisiana, United States. The longer of the two bridges is 23.83 miles (38.35 km) long. The southern terminus of the causeway is in Metairie, Louisiana, and the northern terminus i. CrossesLocale and , Louisiana, U.S.Maintained byDesignLow-level with mid-span HistoryThe idea of a bridge across Lake Pontchartrain dates to the early 19th century and, the founder of Mandeville. He started a service that operated into the mid-1930s. In the 1920s,.