The peak season surcharge applies to spot market freight originating in California and low-volume shippers who move less than 10 loads per week.
Logistics executives raised concerns that congestion building across heavily disrupted inland supply chains could flow downriver to Europe's two largest gateways and tie up import containers trying to leave the ports.
Draft and load restrictions, work interruptions, and overdue infrastructure repairs are hampering breakbulk handling in the region.
