This piece of real estate has had various names over the years, but the location has always been the same. I think of it as Portland’s answer to Rome’s Coliseum. The location is practically city center. If one thinks of Broadway as being Seventh Avenue- the center street for the downtown area, this football sized field enclosed with seating all-round has entrances on 18th, only 11 blocks away. Presently it is named Providence Park and is home to the Portland Timbers. The link shows an ariel view and the shape of the arena, an oval bowl with the entrances on the rim.
http://providenceparkpdx.com/