What size freight barges were planned to use the improved Vistula River channel?

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Following World War II, efforts to restore the Vistula River as a navigable waterway included the construction of storage reservoirs and spillway dams. These improvements were designed to adapt the river channel to accommodate freight barges with a capacity of 600 to 1,000 tons.1

It should be noted that channel improvements in the section near Kraków, which involved the construction of several spillway steps, created a channel specifically navigable by 300-ton barges.2