93 113 | The Hoover Dam Dates, NRHP and NHL

Notice the dates the Hoover Dam was added the the National Register of Historic Places (NRHP) and the National Historic Landmarks (NHL).

• 4/8/81 = 4+8+81 = 93
• 8/20/85 = 8+20+85 = 113

Also notice when its was built, 1933.  The coordinates are a curious 114'44'16W.

• Boulder Dam = 2+6+3+3+4+5+9+4+1+4 = 41
• Hoover Dam = 8+6+6+4+5+9+4+1+4 = 47