On June 20, 2008, in Washington, DC, the Postal Service issued a 16.50-dollar Hoover Dam Express Mail stamp in a pressure-sensitive adhesive pane of twenty. Carl T. Herrman of Carlsbad, California, designed the stamp.
Named after President Herbert Hoover (1874-1964), the Hoover Dam is a national historic landmark located on the Colorado River on the Arizona-Nevada border. The stamp artwork, by Dan Cosgrove, Chicago, Illinois, depicts a view looking upstream. Nevada is on the left, and Arizona is on the right.
Fifteen million stamps were printed in the offset process with microprinting "USPS" by Sennett Security Products/Banknote Corporation of America, Inc. (SSP/BCA), Browns Summit, North Carolina.
Postal Bulletin (June 5, 2008).