SC Ports marked a milestone Tuesday as the OOCL Iris arrived at Wando Welch Terminal, becoming the largest vessel ever to call the Port of Charleston with a capacity of 16,828 TEUs. The previous record was held by CMA CGM MARCO POLO, which first visited in 2021 with a capacity of 16,022 TEUs.

The arrival of the OOCL Iris highlights SC Ports’ continued investment in infrastructure to accommodate larger ships. With a 52-foot harbor depth—the deepest on the U.S. East Coast— mega container ships can access Charleston’s terminals at any time, ensuring efficient cargo handling regardless of tides.

“SC Ports’ strategic infrastructure investments allow us to continue welcoming the largest ships calling the U.S. East Coast,” said SC Ports President and CEO Barbara Melvin. “The OOCL Iris calling on the Port of Charleston is evidence of our commitment to providing highly productive port service to our customers.”

The vessel’s arrival coincides with the near completion of a terminal toe wall project that will maintain a 54-foot berth depth, further enhancing Charleston’s ability to serve massive cargo vessels. SC Ports is investing nearly $3 billion in modernization efforts, including expanded cargo capacity and rail infrastructure to accelerate goods movement.

With taller ship-to-shore cranes, widened turning basins, and high-efficiency terminals, SC Ports provides a competitive edge for ocean carriers and cargo owners operating in the booming Southeast market. The OOCL Iris, launched in December 2024, will join OOCL’s Trans-Pacific East Coast Express (ECX1) service, strengthening connections between Asia and the U.S. East Coast.

Asia remains SC Ports’ largest trade lane, accounting for 50% of total port volume. Charleston serves as the final U.S. East Coast port in the rotation, allowing fully loaded vessels to depart without tidal restrictions, maximizing efficiency for exporters.