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Stable flood proof abutments are critical. If not a log pig then concrete sandbags locked like bricklaying and reinforced with vertical steel bars rammed right through into the base foundation.

And you need to be confident that the rating is current and not old. Floods and age can compromise abutments and bearwrs and decking. If in doubt get down where you can watch span bearers deck and...

I read it as "APPROXIMATELY" 14 tonne gross max and no more than 5 tonne per axle. Best ask a cop.