New projections from the U.S. Bureau of Reclamation suggest that Lake Mead's water levels could decline by as much as 33 feet over the next two years, fueling concerns about drought conditions and water availability in the Colorado River basin. The reservoir, a critical water source for approximately 40 million people, was at 27 percent capacity and 1,042.52 feet as of July 17. This level is only about six and a half feet above the reservoir's historic low since the Hoover Dam's construction in the 1930s.
The Bureau of Reclamation's 24-month study, updated and released on July 15, forecasts the reservoir's elevation to reach approximately 1,009.69 feet by June 2028. This anticipated drop of nearly 33 feet within a two-year span has led to dire warnings from some locals.
The water levels in Lake Mead are directly tied to the Colorado River's allocations. For the Las Vegas valley, Lake Mead supplies about 90 percent of its water, with the remaining 10 percent sourced from wells. Officials from the Southern Nevada Water Authority (SNWA) have indicated that they are not currently worried about the water supply for Las Vegas, citing Nevada's history of using less water than its allocated amount. This has been attributed to SNWA's water recycling efforts, which return water to Lake Mead.
The Bureau of Reclamation's report also includes 'minimum' and 'maximum' probable estimates, outlining the best- and worst-case scenarios for water levels across the Colorado River system. Even in the most optimistic projections, Arizona and Nevada are expected to face reduced water availability in 2027. This study analyzes monthly operations across 12 reservoirs in the Colorado River system.
Lake Powell, the second-largest reservoir in the system, is currently at 24 percent capacity, holding 3,524 feet of water. The federal government has prioritized maintaining Lake Powell at levels sufficient for the Glen Canyon Dam to generate hydroelectric power. This priority has led to adjustments in water releases, increasing releases to Lake Powell while decreasing them from it, which in turn affects the water levels in Lake Mead.
New regulations concerning river water allocations for 2027 are anticipated to be released in mid-August. The Interior Department and the Bureau of Reclamation are reportedly working on future agreements for managing the Colorado River. These efforts follow a failure by the seven states within the Colorado River Basin to reach a consensus on water management. John Entsminger, general manager of the SNWA, suggested to The New York Times that agreement among the states on water allocation might necessitate Supreme Court intervention, unless a seven-state agreement is reached.