I did find a "transportation resource." But the percentages seem to be for rail+river even though they have separate graphics for each mode of transportation. The fact that twice as much soybeans leave the country through the gulf compared to the west coast indicates to me that a lot of the exporting is done with barges. I was surprised that only 2% leave through the Great Lakes. I know that Toledo alone has three big grain elevators for loading ships from trailroads: Cargill (managed by Andersons), Andersons, and ADM. Maybe when the grain reaches the Gulf, it is loaded into back-haul containers. That would help explain why the Great Lakes usage is low because their infrastructure is for bulk ships, not container ships. Going to Asia would be another reason. But the travel distance is more than competitive for Europe markets.