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Saw this answer in Quora, does anybody sensible know any more about the practicalities of such a scheme piping water from the Columbia River?
It would not need to be a 1000 mile pipeline, about 350 miles would do it. Roughly following Interstate 5. It still needs to be pumped over the Siskiyou mountains, though. The inlet would need to be below the Bonneville Dam, as the water is needed upstream to generate electric power. So going down the east side, following Highway 97, would not work.
The pipeline does not need to go all the way to Los Angeles. It can end at Lake Siskiyou near the city of Mt Shasta. From there, the water would flow down the Sacramento River to the Delta, where the existing California Water Project would take over.
https://www.quora.com/Why-couldnt-a...iver-to-Southern-California?top_ans=177978878