here's a link to a video of the flash flood out by highway sixty, if you're intrested. apparently the road was closed for quite some time this weekend, so people got out of their cars and took pictures of what was going on.
keep in mind that what is usually out there is dry ground. it's not actually a river.
EDIT: actually, i made a mistake. this video is not from this series of storms, it's from a lesser storm that hit about a month ago. SO... if this is what a lesser storm did, just imagine.
it's still a cool video.