Minor mitigations at best. Those environmental impact studies aren’t about finding a way to cause no interruption to nature, they are about acceptable losses determined by pro-dam lobbyists if any regulations exist at all. But these are the exact kind of laws both Democrats and Republicans have been gutting for decades in favour of small government.
Turning a river into a lake is not good for river dependant life. Blocking half of it behind a wall is terrible. Fish ladders are not a replacement for open river, it will only save an “acceptable” fraction of some species like salmon, not allow full passage of all life in the ecosystem.
The forests wouldn’t exist were it not for pre-colonial salmon numbers. Their rotting carcasses are responsible for almost a quarter of the nitrogen in all the soil in the British Columbian and Tlingit forests (that goes up to 70% in riparian zones). The environmental impact of dams is no more forests as they die of malnutrition. So in a way you’re right, no more forest fires if there’s no forest. We can do better than dams and MUST do better than dams.