The Northwest Seaport Alliance (NWSA) has become the latest US port to upgrade its facilities to accommodate bigger containerships.

NWSA, a tie up between the ports of Seattle and Tacoma, has authorised work on its deep-water Terminal 5 more than $300m in infrastructure improvements to the facility.

“The modernization of Terminal 5 represents a transformative investment in our region to support our state’s economy,” said Stephanie Bowman, Port of Seattle commission president and co-chair of the NWSA.