 On June 27, 1962 the diversion tunnel was blocked, and water was stored in Navajo Lake for the first time.Navajo Lake was the first reservoir of the Colorado River Storage Project to begin filling; the next, Flaming Gorge, would not start filling until November.The main embankment was topped out shortly thereafter on August 22, 1962; however, work on other features of the project, including riprap placement and final concrete work, continued.