Allowing them to be damaged and destroyed is very easy. It depends how you want to implement your mechanism for repair however.
Originally workers and dozers repaired the 'towers' next to each bridge (the ones that you see in World Builder). The game is no longer coded to display the towers, so using those as a repair mechanism is out.
Youd have to get bridges classed as structures but that will limit all bridges to a fixed size and length which means redoing any maps with them on.
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