 A number of sites sacred to the Navajo people would later be flooded with the filling of the lake.Other features to be demolished or relocated included the towns of Rosa and Los Arboles, several cemeteries along the Los Pinos River, and sections of the Denver and Rio Grande Western Railroad.The primary construction contract for the dam was awarded to Morrison-Knudsen, Henry J. Kaiser Company, and F&S Contracting Company on June 25, 1958 and work began a month later on July 30.