Theres videos from different people as the flooding started live. It's WILD to watch what happens in a short span of time. We're talking under 30 minutes I think before it starts overtaking a bridge. The water will sweep you up and drag you around too, the random debris is what's fatal.
I watched the first couple minutes of this video (certainly wasn't going to watch 40 minutes) then skipped ahead in chunks, thinking it was clips from different locations.
Then I scrubbed around and realized, no, it was the same place, which left me stunned.
Make sure to watch the last 3-5 minutes or so for the cherry on top. Then I recommend skipping back to the beginning to really drive home how insane this was.
I will never again be cavalier about flash flood warnings.