These parallel bridges cross the eastern end of Lake Pontchartrain in southern Louisiana from New Orleans to Slidell.

After Hurricane Katrina on August 29, 2005, the old Twin Spans suffered extensive damage, as the rising storm surge pulled or shifted bridge segments off their piers.

The Louisiana Department of Transportation & Development (DOTD) accepted a bid of $30.9 million from Boh Brothers Construction Company on September 9, 2005, to reconstruct the bridges, starting with the less damaged westbound span.

Due to the prefabricated steel segments, there were both a 45-mile (72 km)-per-hour speed limit and weight restrictions on the westbound span.

Additionally, the span was closed periodically for maintenance work, which is covered by Phase 3 of the original contract.

This $803 million project constructed two three-lane bridges 30 feet (9.1 m) above the surface of Lake Pontchartrain, with an 80-foot (24 m) high rise near Slidell.