Was wondering about that myself K.A.
Thought perhaps there was an old asylum located nearby or something...
The bridge is called "Crazy Bridge" by locals because it gives the illusion that it is sagging in the middle and seems "crazy" for one to cross when in reality the bridge is not sagging out of lack of proper foundations but is built to fit the contour of the hills that it located between.
What exactly is "crazy" about this bridge? Is it a nickname or is it crazy that it is fenced off to the public and perhaps privately owned? I have seen lots of the latter. It is not that uncommon.