Our Life and Times Along the Colorado Northern Front Range and Plains
I'm reminded a bit of stadium architecture too.
Yes, those arches are similar.
Brutalist architecture! I found the Wikipedia article in the subject but did not find an explanation of where the name came from. Interesting
One theory is that it refers to the french word for raw concrete "béton brut." As with all things on the internet take it with a grain of salt. https://en.wikipedia.org/wiki/Brutalist_architecture