>>22810265
Because they are stupid and think they can get water from the Great Lakes while being ignorant of the largest fucking river in North America they would need to go through.

Anyway pic related a real plan made by engineers. It takes water from the Yukon river and supplies to to the continent, also a video.
https://www.youtube.com/watch?v=_MibzpJ54do
https://www.youtube.com/watch?v=D0dsc-341O8