go on and on and on. then you have to watch it to make sure one doesn't break. when the levee breaks, you've lost all the water behind it. let me show you pictures. this is what the river looked like yesterday. as a big hunk of ice was rolling down the river -- >> my goodness. >> that was a dock. >> can we hear that? >> go ahead. >> you guys see, it broke it all up. >> there goes another one. that's a rollup dock. put your boat on there and run that big wheel. it goes up. that's taken up. that's down river now. >> amazing. >> it's the amazing am of power. now, what happens, this big hunk of ice, if it hits a bridge or a number of bridges, then you have an ice jam or an ice dam and water can come up rapidly. they're always watching that. they use explosives to break up those pieces of ice if they start to make more flooding like that. >> flooding for a long time. >> yes. >> chad myers. amazing video. thank you so much.