WASHINGTON — U.S. ports are worried about how ever-growing cargo ships and an expanded Panama Canal will affect their volume and revenues in the future, prompting calls by port authorities and civil engineers for increased investment in their infrastructure.

“Post-Panamax” ships, the new, larger cargo vessels that will be able to traverse the canal after its expansion in 2015, currently have a relative dearth of U.S. ports to choose from. The larger vessels require channel depths of at least 50 feet in order to enter ports fully laden with cargo, according to the U.S. Army Corps of Engineers.

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