This is it, warns one water advocate, “it really does (make critical) the fact that we have to start changing.” Lake Mead water levels have sunk to their lowest levels on record (below the levels when the dam was built) at 1075 feet. This is a major problem, as USA Today reports, since Las Vegas water authority’s current “straws” glean water from 1,050 feet and 1,000 feet – leaving the first straw just 25 feet away from pulling in air.