Besides the hazards of the construction work (the falling rock, the explosives, electrocution, behemoth machines); besides the hazards of off-hours (fist fights, drunken binges, social diseases from the whores who camped about); besides all this, there was the heat. The low-lying parts of the Colorado and Sonora deserts are the hottest corner of North America, and we are speaking of temperatures in open, ambient air. The Colorado’s box canyon held heat like an oven with the door open about an inch. Workers sometimes sacrificed eggs to see if they would actually fry on a sun-fired rock. The
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