The Lake Pontchartrain causeway that links New Orleans with the North Shore is increasingly trafficked as North Shore suburban development expands. In addition, metropolitan transportation experts view the causeway as an important component of their evacuation plans for New Orleans. This project proposes expanding the transit capabilities of the causeway as a multi-functional transportation route that accommodates not only automobile ridership, but also monorail commuters, pedestrians, and bikers. In this scheme, transportation hubs on both sides of the lake facilitate the causeway’s use. Also featured is a water treatment system that collects and processes sediment, creating landscaped lagoons along the lakeshore. Adapting the causeway in this manner reconnects the increasingly separated north and south shores of the lake and adds public amenities to both communities.