5 or so years ago I wondered:
Where would be the best spot to bore a tunnel to divert water from the Missouri/Mississippi watershed to the Colorado River watershed?

What did I learn?

Denver was already doing.... the opposite!

There are multiple tunnels bringing Colorado River water through the mountains to Denver,
where it ends up in the sewer plants hat empty in the Platt River system and flows east to the Mississippi watershed.

There is a chapter in “Sand County Almanac” about the swamp that used to exist where the Colorado emptied into the Gulf of California.
Sand now.

I took a great white water rafting trip about 1979 down the Colorado River.

Saw a great documentary last year about Dick Griffith
the legendary river guide and wilderness marathon racer
who took the first inflatable raft over Lava Falls
and then returned in his late 80s to be the oldest to row himself over lava falls.

https://themilepost.com/articles/the-last-run-of-dick-griffith/

https://www.pbs.org/video/canyons-ice-the-last-run-of-dick-griffit-i3uoau/

All this made me want to runs the Colorado again.