This Week in Roosevelt History: September 8-15 September 8, 2010May 29, 2015 by fdrlibrary, posted in This Week in Roosevelt History September 11, 1944: FDR dedicated the Boulder Dam by pressing a key in Washington to signal the startup of the dam's first hydroelectric generator in Nevada. FDR at the Boulder Dam. September 30, 1935 FDR Library Photo Collection. NPx. 47-96:1798.