The United States has six truly great rivers. The Colorado, Snake, Columbia, Missouri, Mississippi, and the Rio Grande.

Even your first sentence made me learn something new. I personally swam in two large rivers of the US. Tennessee and Delaware rivers. It’s a first time I hear about Snake and Columbia rivers. I guess I have a lot to learn about US geography 😆. Well, as an immigrant it’s not surprising. Between you and me, sometimes US born know less lol.

An extensive delta that was built up over centuries is entirely dry.

I hope we don’t end up with this wonder of nature completely disappearing. Can you imagine so many people loosing it’s source of drinking water including source for agriculture? 😱 That would make a huge impact all over the US including part of Mexico. Knowing that California is producing most of the craps, vegetables and fruits for the entire US, that is really scary.

Frankly, most people don’t care a bit so long as their water runs out of the tap.

That’s exactly what crossed my mind. No one cares as long as they have food and water on their table. It’s tooo difficult to start doing something to change the inevitable course.
As you mentioned “It’s a mess!”.