This bridge is unique in that the piers are actually pontoons. The pontoons float in the water. This allows the bridge to rise and fall with the height of the river water. The pipes sticking up out of the water guide the pontoons to keep them in the same position. That keeps the bridge from moving sideways. The approaches on each end are on a hinge. That allows the ends of the bridge to maintain contact with the shore even when the bridge changes height.
There are many long and narrow islands on the east side of the river between I-494 and Grey Cloud Island, but this is the only such island that is connected to the mainland via a bridge.
The photo above is a view from summer 2006. The two photos below were shot in November, 2008. The bridge appears to have been recently painted.