I used it in a sentence the other day and my wife said she had never heard that word before (she says pavilion instead).

I looked it up online and none of the dictionaries refer to is as a pavilion-like covering except Wikitionary: https://en.wiktionary.org/wiki/bowery

I googled park bowery reservations and the city of Roy's website popped up, so maybe it's a Utah thing: https://www.royutah.org/369/Park-and-Bowery-Reservations.