Again you are speculating. I gotta believe we would have heard from someone down stream who was harmed by the negotiated settlement.
That's not what happened here.
Perhaps the cattle did crap upstream, they do that with or without a stock pond.
But just as a beaver pond slows and then cleans water by allowing heavy sediments, like your bullshit, to fall to the bottom where it breaks down
allowing trees and plants to thrive...
The Colorado is interesting because there are many dams on it. Yet, as you point out every drop that folks claim, gets to them.
Other wise it would uncontrollably flood or perhaps slow to a trickle.
As much as the EPA wants to claim that water, they can't. Stock ponds are exempt. But you know that.