Lakes can dry up. So that's no better than a river I would think.
Either way, there are no fully safe and permanent sources of cooling water, is what I'm taking away from this.
Which ones? The North American Great Lakes, maybe? Anything else?
The Aral Sea was the third largest lake in the world. Within the human time scale of the last six decades, it's lost 90% of its area.
Lakes can dry up. So that's no better than a river I would think.
Either way, there are no fully safe and permanent sources of cooling water, is what I'm taking away from this.