Crossed 3 flash floods in Southern Utah a couple years ago coming out of a camping spot in Southern Utah's Henry Mountains. Monsoon rains for 3 days straight. If I didn't cross I'd be stuck in Hanksville, UT until things dried out...it was worth the risk. I appreciate the difference between the river crossing and flood waters. Mine weren't as deep as yours, but the bottom was ALL sand. Lots of skinny pedal going in to it and nursed it through to the other side...plus I was hauling a small trailer. Stupid? Probably. But I didn't end up on the news.
I did have to get winched off a muddy shoulder when I couldn't get ANY traction...no lockers...and the trailer was pulling me down in to the desert and away from the road.
I'd do it again.
Tech content: People are saying it wasn't that bad, or more experience would get you through it. The problem with that comment is it really sucks to repair your rig through all the learning experiences. So, you need to cross a swiftly moving, swollen river with water well over the rails. The bottom is sand or mud and we're talking 100 feet across or better. Does experience tell you to go around or find a better crossing, or strap up BEFORE you get in too deep, or hit it so fast you never have to worry about what's on the bottom, or....? I was honestly lucky to get out of my situation without a worse outcome. I had to maintain 30MPH on the sandy washes or I'd be stuck. Hitting those corners and sliding to keep the trailer behind me was exciting, but my stupid driving when I was a kid kicked in and I drifted through with the kids laughing in the back seat and my wife praying in the front. My buddy couldn't make it up the hill to meet us because the roads were to bad, and he wasn't in a Cruiser.

rolleyes
So what's the tech tip to get through the river without getting stuck? My technique was to go fast enough I'd stay on top of it. No bow wave, just a huge splash.