Hoover Dam

You're near the Nevada-Arizona line, where the Colorado River once ran free through Black Canyon before human ambition bent it into one of the largest concrete structures ever built.

Hoover Dam was the answer to a problem that had plagued the American Southwest for a century: the Colorado River was either flooding the Imperial Valley or disappearing entirely in dry years, and seven states could not agree on who owned it. The Colorado River Compact of nineteen twenty-two divided the river's flow between upper and lower basin states, creating the legal framework for what came next. Congress authorized the Boulder Canyon Project in nineteen twenty-eight, and in nineteen thirty-one the Bureau of Reclamation awarded the construction contract to a consortium called Six Companies, a partnership of six western construction firms who bid the job at just over forty-eight million dollars.

The man who built it was Frank Crowe, a Bureau of Reclamation veteran who had spent decades designing irrigation dams across the West. Crowe drove his crews through the Depression-era desert with a ferocity that made the dam legend: peak employment hit over five thousand workers, many of them desperate men who had come to the Nevada desert with no other options. The official death toll was ninety-six workers, though historians count dozens more who died of heat exhaustion and carbon monoxide poisoning in the diversion tunnels and were classified differently. The first to die was a government surveyor named J. G. Tierney, who drowned in the river on December twentieth, nineteen twenty-two. Thirteen years later, to the day, his son Patrick died in one of the dam's final accidents.

The dam was completed two years ahead of schedule in nineteen thirty-five. At seven hundred twenty-six feet tall, it was the tallest dam in the world at the time. Behind it, Lake Mead would grow to become the largest reservoir in the United States, holding two years of the Colorado River's entire flow, the water that made Las Vegas, Phoenix, and Los Angeles possible.