Godzilla #9

Godzilla attacks the Hoover Dam (then called Boulder Dam) on the Nevada border. The dam bursts and a huge torrent of water washes Godzilla all the way to a Las Vegas strip. Godzilla contemplates attacking the city and does so when he is shot by a mobster. During his rampage, the rest of the damaged dam gives way and the water rushes toward the strip completely destroying it. After Godzilla comes to his senses he leaves.