At its peak, the camps housed around 3,500 workers. Two worker camps housed them. The "Upper Camp" was built upstream and housed affluential and skilled workers, such as supervisors and engineers. The "Lower Camp" was downstream of the site, housed the less inluential laborers, and was further segregated by American and Mexican workers living in separate areas of the camp. Upper Camp was inundated by the dam's own reservoir, but although it was on dry land, Lower Camp has no trace remaining.