Sign in

Private company

Six Companies, Inc.

American corporate joint venture formed to build the Hoover Dam

Six Companies, Inc. was a joint venture of construction companies that was formed to build the Hoover Dam on the Colorado River in Nevada and Arizona. They later built Parker Dam, a portion of the Grand Coulee Dam, the Colorado River Aqueduct across the Mojave and Colorado Deserts to urban Southern California, and many other large projects.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

1931Founded1

See how the biggest companies compare on our leaderboards

"Cottages erected by Six Companies, Inc., in recently developed section in southeast limits of Boulder City Nevada.... - NARA - 293623
Photo: Unknown author Unknown author or not provided, Public domain, via Wikimedia Commons3

Six Companies, Inc. was a joint venture of construction companies that was formed to build the Hoover Dam on the Colorado River in Nevada and Arizona.2

Timeline

  1. 1931Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

  1. 1
  2. 2
  3. 3