How quick a road can wash out..

I have seen flooded roads, and I have seen washed out roads, but I never realized how quickly one can turn into the other. Realize that the river has been working on this road for a while, but when the video clip starts the road appears to still be in good condition.

Just what is that flappy noise? It's really annoying. Oh well, I guess people who actually make videos can put whatever sound they want on them. Found on Marty North and Greenfield Park.