My thoughts are that unless you've got a LOT of time AND explosives available, the piers aren't worth troubling with. Build to withstand not just the weight of the bridge, but flood waters as well, unless they've been constructed with demolition chambers built in, they're not going anywhere in this lifetime...
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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