For the most part, the bridge is being chopped and removed in huge chunks with a massive crane. The piers are being jack hammered into pieces of rubble with a massive machine (the knocking action can be heard from dozens of blocks away).
For a previous post about the bridge, see:
http://my1923foursquare.blogspot.ca/2014/08/seaway-international-bridge-walk.html
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Here you can see how they chopped and removed half a large span, with the other half held in place with temporary scaffolding. The intersection in the photo is Second Street (one of the main roads).
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Pier demolition. You can see how deep the bed of rubble is in this photo (the full height of the water truck).
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They were either hosing it down for the heat, or to keep down the dust. I'm not entirely sure.
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They're probably spraying it to keep the dust down. That's what they started doing in masonry demolition in Austria a few years ago. Better than nothing but not perfect either.
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