It is, sadly, not in widespread public awareness. But some research is there, such as [1] [2]. If a hydropower dam has been built today on lower Mississippi it

It is, sadly, not in widespread public awareness. But some research is there, such as [1] [2]. If a hydropower dam has been built today on lower Mississippi it would over time fill with a cubic-mile-worth of toxic sediment on the top of currently existing problems. This is not an exaggeration, an additional superfund site with a volume measured in cubic miles, due solely to the hydro project itself I don't see how else can it be construed. [1]https://waterlawjournal.com/sedimentation-in-california-reservoirs-a-long-term-problem-of-immediate-concern/ https://waterlawjournal.com/sedimentation-in-california-rese... [2]https://link.springer.com/article/10.1007/s12665-019-8146-y https://link.springer.com/article/10.1007/s12665-019-8146-y