During intense floods, the Las Vegas Wash surges and feeds large amounts of water into Lake Mead from the West. Upon reaching Lake Mead, water from all these sources mixes and flows downstream through the basins. On average, it takes water about 2.6 years to make its way through the entire lake.
Clowns must be fucking with the water that feeds lake mead.
https://www.nps.gov/lake/learn/water-source.htm