Today is the anniversary of the last concrete pour at Boulder (Hoover) Dam #ColoradoRiver

#OnThisDay in 1935, the last concrete was place in Hoover Dam. Wow! For more info: http://t.co/9QBr10fxnB pic.twitter.com/7wL6XjJB1f

— Reclamation (@usbr) May 29, 2014