In September 2001, construction began to build an elevated causeway for Route 54 to the west of Fenwick Island in order to prevent flooding from high tides and storms. The project involved building the new causeway to the north of the original alignment, using pre-cast concrete segments. The project, which cost over $15 million, was slated to be finished in August 2003. In 2010, a $10 million project began to add a center left-turn lane along with bike lanes and sidewalks to the portion of Route 54 between DE 20 and Mallard Lakes, a section of road that was targeted for safety improvements due to rapid development; this project was completed in 2012.