Historic Colorado River Shrinking Leaves Major Reservoirs Near Empty

Lake Mead and Lake Powell have dropped to historic lows, threatening water supplies for millions of people across the American south-west. Lake Mead is at its lowest level since it was filled nearly 90 years ago, sitting at less than 27% of its capacity. A white mineral ring left from when the lake was full in 2000 now towers 175 feet above the current water level. Colby Pellegrino of the Southern Nevada Water Authority noted that a 1970 pipe built to bring municipal water into the valley is now completely exposed and out of use. Las Vegas gets over 90% of its water from Lake Mead and spent $1.3 billion in the early 2000s to build a third intake nearly 200 feet deeper in the reservoir, alongside a new pumping station.

The Crisis

The Colorado River supplies water to more than 40 million people across seven states and irrigates over five million acres of farmland. Kyle Roerink of the Great Basin Water Network warned that the west has used more water than the river can provide for decades. A 26-year megadrought starting in 2000 has reduced the river's flow by 20%. The winter of 2025 to 2026 saw record low snowpack in the Rockies, while extreme heat has dried out soils and plants so more water evaporates or is absorbed before reaching streams. Phoenix receives about 40% of its water from the river via the 330-mile Central Arizona Project canal, and nearly 100% in some metropolitan areas. Max Wilson of the City of Phoenix stated that federal cuts mean about 50% less water will flow through the canal next year. Phoenix is building advanced water purification plants using reverse osmosis and ultraviolet light to produce nearly 7 million gallons of recycled water daily when it opens next year.

## Context

The Colorado River is governed by strict compacts and water rights among upper and lower basin states, but prolonged drought has forced the federal government to step in with mandatory cuts. Cities across the American south-west are increasingly investing in massive water recycling and purification infrastructure to adapt to permanently lower river flows.