I don't see any problems that barge will pack 30 ton maybe 40. For working on a lake it is fine don't think I would try it here.
When a barge only has 6 inches of freeboard you know its loaded. Excavators and cranes are the worst on a barge if you are lifting or using a excavator to dredge with. Barge rolls machine slides off you need to chain down a crane or excavator if you are making the barge roll.
BMs barge even has mini spuds on it for holding it in place when working in a fixed spot.