A big change in water

I'm on the river for about an hour, the water is great with about 5ft of vis. I get to a certain hole and fish up to the middle to a point where it gets deep. walk back down about 30yds and cross. walk around to the top of the hole and in a matter of the 5 minutes that it took, all of a sudden the river came up, was brown, big chunks of ice and other debris floating down. that turned to shit real quickly.