Heading north of the city, Lake Pontchartrain is a brackish estuary connected to the Gulf. Not only home to the longest bridge in the united states (the causeway runs from New Orleans north across the lake), fishing Lake Pontchartrain you'll find the classic inshore options: redfish, trout, and flounder. You might also know that Pontchartrain is home to some massive sheepshead. The world record sheepshead was caught here weighing over 21 lbs.