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Looking around a bit more, the Oroville Dam: (a) is much, much larger (it's higher, and several times the length); (b) also took just a few years to build; (c) had a much lower number of casualties (~30); and (d) was built in the 1960s.
Dangerous to infer too much from just two examples. But I wonder if we simply got a lot better at safe construction from the 30s to the 60s?
After workers comp laws made accidents expensive we suddenly improved for some reason!
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