I’m aware of the set-up you describe (heck, I’ve designed the set-up you describe). But what I’m trying to point out is that in Korea, we drove through water...every single time we wanted to cross the creek (the bridges weren’t strong enough).
Soooo...not knowing anything about Fort Hood, or whether or not this crossing is typically wet or dry...soldiers in our Army have been exposed to the notion of crossing them while wet - routinely. And, my little ole suggestion is that perhaps the army should put depth poles next to these, to prevent these tragedies.
I’m guessing that you weren’t using low-water bridges in Korea but fording the river, and you didn’t cross the Korean rivers when they were flooded.
If a low-water bridge is covered with water, by definition it’s flooded.