Dam Ice
The dam gates open and close with a tension rod much like a screen door, with one big exception -- each gate weighs 200 tons, which is just a little less than the Statue of Liberty.
When one of the replacement pins wouldn't fit in the tension rod, an engineer suggested freezing the hardware to contract it slightly.
Alas, that didn't work. But the engineers did find a use for all that ice.
"In early July and August, it's hot, and there's no wind in the dam" said Alan Duley, spokesman for the Army Corps of Engineers. "We put the ice machines down there so people could fill up their Gatorade and water bottles."
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