Clues for "Where is this?"

OK! We have established that site follower Ellen knows where this is. She has an eagle eye and has been quick to ID places in the past. For now, she is sitting on her hands!!  (:

Here are some clues for those of you who are scratching your heads wondering.....  This outdoor amphitheatre is south of River, west of Swan, east of Campbell, and north of Grant. Any guesses? Good luck!