I always wondered if there'd be a way to basically create a deeply sloped man-made river system that essentially brings salt water deep inland - say as far as

I always wondered if there'd be a way to basically create a deeply sloped man-made river system that essentially brings salt water deep inland - say as far as Colorado, and perhaps it can be desalinated naturally setting up some filtration systems along the way to catch some of the salt. Imagine if we had a river as big and wide as the colorado river coming from the pacific ocean and back into the colorado river. It might even change weather systems to bring more rain in the area because there's more water vapor. I'm not a scientist and don't know the specifics on how/if that'd work but it'd be a pretty interesting experiment.