Oh I always know the water depth. First use the dog to check then if any doubt I carry a pair of
Wiggley over the boots waders in the attic rack.
Not only do I know the depth but what type of bottom this is my 50th year off roading. I can take the waders out of the attic rack now in a couple of weeks we will have "hard" water, and drive on it. Which reminds me it is time to take the bug spray out also it can freeze hard enough to burst. Don't ask me how I know
The worst I've done was in the early 80's in Washington State in my FJ55. One night at a bar a guy from the ship kept begging me to take him 4 wheeling. I finally told him buy a couple of 6 packs to go and I will.
On one trail there was a steep short hill you couldn't see over that I would floor it going up and turn on the windshield wipers. People would look at me and say why then we would fly over it and land (and bottom out) in a wide stream throwing water everywhere. Cool. Except that night when I came over the hill in mid air I was looking at a beaver pond. Damn beavers had built a dam and flooded it. When I landed my headlights were under the ice and I had presence of mind to turn off the engine immediately. We were more than 10 miles from the nearest house.
Dug the come a long and cables out and broke ice to hook up to a tree and inch by inch pulled it out. After more than an hour on dry ground opened the doors and water poured out. Had a monopoly game in the back and funny money came pouring out as well. Tried the ignition and after a couple of tries it started and drove back home. Soaking wet in below freezing temps with the heat on. Learned several lessons that night on what not to do and was lucky to live to think about them.
Drained all fluids the next weekend at the automotive hobby shop on base and repacked the hubs. With the GX and most vehicles today with all the electronics it would have been dead in the water. Quite literally.