Six Companies

Six Companies, Inc.
Company type	Joint venture
Industry	Construction; Railroad;
Founded	February 1931
Key people	Frank Crowe
Owners	Kaiser-Bechtel (30%); MacDonald and Kahn (20%); Utah Construction Company (20%); Morrison-Knudsen (10%); Pacific Bridge Company (10%); J.F. Shea Co (10%);

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.