Hoover Dam
In 1933, Douglass was hired as a design engineer by the Denver office of the United States Bureau of Reclamation, he was assigned to the civil engineering office. When he joined the Bureau, construction of the Hoover Dam was underway, and he was assigned to preparation of construction drawings for the Boulder Canyon (Hoover Dam) Project. He spent more than 20 years with the Bureau of Reclamation until his retirement in 1954. Douglass was eventually placed in charge of Hoover Dam and the surrounding park land from 1950 to 1954.