I agree with all the warnings stated. You mention you new these had just occurred. Being able to judge the water flow and eddies over a smooth area helps to tell the conditions.
In more remote areas of course other dangers mentioned can be present. Scoured out holes can form and be dangerous. Walking areas you are not familiar with using a stick or line and bobber can be one way to judge a crossing but not fool proof. In swift current that can also be a danger to your body.
I have done a lot of whitewater canoeing and the force of water on a pinned kayak or canoe can be tons. We had to use come along winches to free some of them.
I regularly have to cross seven of these low water bridges to get to my boat. In the spring at times I have waited several hours before attempting them. Going slow and steady is the best approach but of course after a few test crossing you sometimes can't resist a little fun!
This hole when covered in water could flood a stock intake H3.
If your first to come along, winch time!
The force of the water is awesome. Campers in this area a few years ago were devasted.
Be carefull out there!