The stretch of riverfront below the Gateway Arch should better withstand flooding after being raised about two feet, meaning fewer shutdowns when the Mississippi River rises in the area popular with tourists.

Completing the renovation of the riverfront marks a major milestone in the $380 million restoration of the Arch grounds.

Leonor K. Sullivan Boulevard, which runs along the river under the Arch, is set to reopen to two-lane traffic on Saturday. The road, which runs along the Mississippi River under the Gateway Arch, has been under construction and closed in chunks since November 2013.

It was narrowed from four lanes to two to make room for sidewalks and a bike path, which connects at the north end of the Arch grounds to the Riverfront Trail that runs to the Old Chain of Rocks Bridge. The road is wider in spots for buses to make drop-offs.