Captain William Moore Bridge -- where are the other supports?!

This is an asymmetric, single pylon cable stayed bridge on the Klondike Highway heading north to Fraser, BC.

It was the first of its design in the USA, apparently.  The side without the pylon rests on the rock which has a massive fault line in it. 

Our guide said it has moved up to three feet to accommodate shifts in the rock face from time to time.  They allow one commercial vehicle on the bridge at a time (alternating one way) and there is a speed limit of five miles per hour.