Noun
tailwater (countable and uncountable, plural tailwaters)
The water located immediately downstream from a hydraulic structure, such as a dam, bridge, or culvert.
Some are also being caught off the rocks in the tailwater. Source: Internet
The tailwater is mostly free of ice, but boat ramps are iced in. – Good: It takes some work to get into the tailwaters, but they are mostly open and can be fished. Source: Internet