EDIT: Oops, I just re-read your comment and looked again at the photo.... My bad... You are correct! The guy is running south towards the Mather Gate and so, in fact, that is the student union building... I can see the Administration building in the background.....
Heh, Heh. My gassing was when an errant tear gas container bounced of the car I standing next to near the old People's Park -- I was taking photos of the craziness -- actually until the cannister went awry -- everyone was mostly standing around and laughing. It's very hard to keep laughing when you can't breathe however.....Still brings a tear to my eye to this day.
Back to the puzzle....
The bridge is famous (in part) for it's length -- but it's not the Knight's Ferry Bridge in California -- look at the trees -- those are not found in California! And also, have you ever seen that much water under the Knight's Ferry bridge?
Mark