Our national motto at Hoover Dam: E Pluribus... oops

While Angler was off giving credit to congress for reaffirming our national motto is In God We Trust, it turns out the man child President of the United States isn't the only one who can't get it right.  I've just returned from Las Vegas where I went off strip to check out Hoover Dam.

Behind the two bronze statues near the visitors center is a couple of speakers piping recorded audio explaining what the tourist is looking at.  I snapped a picture of one of the statues and the plaque of our national seal with E Pluribus Unum, which is correctly described as the phrase that appears on our national seal in the picture, but is NOT our national motto. 

Note I did a quick web search on the topic, and to my knowledge I'm the first person to notice.  Hat tip to anyone as geeky as me who nailed it prior.  Double hat tip if you caught it before our man child POTUS gaffed it on camera.

I left a voice mail for the HD office Sat 11/19 to see if they were aware of the gaffe.