ummm, this stupid tunnel ruins my whole springfield

I don't have mine yet (still working on donuts), but I'm guess it's not in the "middle" and close to the waterfront because people will have different lengths of mountain unlocked depending on how far they are in the game (ie how much expansion they have). If they put it near the middle of a fully purchased SF land area, it's a good bet newer players can't access it until much later.