We don’t get it all from there. Some even goes out of state. And Lake Mead is LOW,
Lake Mead will be receiving a lot of water when the Colorado snow-pack begins to melt in earnest.
https://www.thedenverchannel.com/news/local-news/its-june-and-colorados-snowpack-is-437-of-normal-what-that-means-for-flood-season