Water Overpass, Reid Falls Aqueduct

(Satellite, probably in this section between river valleys where the road is built on the side of the mountain. But, if so, it is covered by trees.)

I've seen a photo of something like this before, but I can't remember where. 

Highway Engineering Discoveries posted
Nice Ideas ....

Comments on the above post

A photo that caught it with a stronger flow.

Highway Engineering Discoveries posted
The Reid Falls aqueduct was constructed to prevent flooding of the highway during heavy rainfall events.
Gerrit 't Hart: In New Zealand, South Island, Arthur's Pass