How expensive/difficult would it be to create two irrigation canals: one from the Gulf of Calfornia, and one from Texas?

The Grand Canal in China is 1,100 miles long. Houston to Albuquerque is about 1,300. Puerto Peñasco is 250 miles to Phoenix. Add another 300 and you’re in Vegas.

Seems doable if drought will be a recurring concern. Obviously salinity would be an issue but I don’t know how difficult that would actually be to fix for agriculture.

Edit: now that I look at a map, the Red River in Texas seems fairly substantial and goes all the way into eastern New Mexico.