Or better yet, invest in pipes.
I'm sure it could be done, but it would cost a fortune. My understanding is the canals were built to distribute water to farmers, and conservation/evaporation wasn't really much of a consideration because California had plenty of water back then.
BTW, I used to swim in those same canals around Modesto and Turlock as a kid. So gross.
According to AI, that pipe would only need to be 43 Feet in diameter, only 43 feet wide. Pretty sure they have that at Home Depot.
And suddenly you can build something else on those pipelines?