KVIG Informative

Southern Nevada’s water agency started tunneling a new intake into the bottom of Lake Mead in 2008, betting that the reservoir would keep falling. It has. The backup pumping station built behind that tunnel is now the only thing standing between the valley’s water supply and a lake that has already swallowed the region’s original intake.

Lake Mead’s surface has dropped roughly 160 feet since 2000, according to the Southern Nevada Water Authority, as sustained drought across the Colorado River Basin has outpaced the snowmelt that once refilled it. The reservoir’s deepest usable point is what the authority calls a “dead pool” elevation of 895 feet, the depth below which the lake can no longer supply water through intakes at all, according to the authority.

The Southern Nevada Water Authority began construction in 2008 on a new intake, built to draw Colorado River water from an elevation below 1,000 feet, well under the lake’s two older intakes. Crews used a 24-foot-diameter tunnel boring machine to cut the passage beneath the lake bed, then anchored the finished intake structure to the bottom with more than 1,000 truckloads of concrete, according to the authority. Water began moving through the new intake, designated Intake No. 3, in September 2015.

A citizen’s advisory committee working with the authority flagged a second problem even before Intake No. 3 was finished: the pumps that moved water out of the older intakes could not operate once the lake fell far enough, no matter how deep the intake pipe itself reached. The authority’s board approved construction of a second facility, the Low Lake Level Pumping Station, in May 2015 to solve that problem.

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The Low Lake Level Pumping Station was built around a 26-foot-diameter access shaft sunk more than 500 feet into the ground, connected to an underground forebay covering 12,500 square feet and 34 separate vertical shafts, each 500 feet deep and 6 feet in diameter, according to the authority. Finished in 2020, the station is designed to pump up to 900 million gallons a day through Intake No. 3 regardless of how low the lake drops. The authority originally estimated the project at $650 million; it was completed for $522 million.

The Low Lake Level Pumping Station went into full operation in April 2022, after Lake Mead’s elevation fell to roughly 1,056 feet, approaching the 1,050-foot floor below which the authority’s original intake pumping station could no longer function. Southern Nevada Water Authority Deputy General Manager for Engineering Doa Ross said at the time that the original intake had gone dry, but that the region had planned for exactly that outcome. General Manager John Entsminger put the combined cost of Intake No. 3 and the Low Lake Level Pumping Station at $1.5 billion.

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The lake has not recovered since. The U.S. Bureau of Reclamation’s weekly hydrologic report put Lake Mead’s elevation at 1,037.79 feet on Sept. 27, 2026 — about 26 percent of capacity, down 0.43 feet from the week before and projected to fall to roughly 1,034 feet by the end of the year. That reading sits below the 1,050-foot threshold that stranded the original intake pumping station in 2022, meaning the Low Lake Level Pumping Station is not a backup anymore. It is the system.

The Southern Nevada Water Authority itself was formed in 1991, when seven local water and wastewater agencies — Big Bend Water District, Boulder City, the Clark County Water Reclamation District, the city of Henderson, the city of Las Vegas, the Las Vegas Valley Water District and North Las Vegas — merged into a single regional utility rather than compete over the same shrinking river. The agency now supplies water to more than 2 million residents through the infrastructure that merger eventually built.

The Interior Department’s current operating guidelines for the river expire at the end of this year, and the seven states that share the Colorado River have spent 2026 negotiating what replaces them, under a Bureau of Reclamation framework that already keeps the river in a Level 1 Shortage Condition and cuts Nevada’s own allocation by 21,000 acre-feet. None of those negotiations will raise the lake. Southern Nevada’s water now runs entirely through machinery its planners built for a future they merely expected. That future is the present one.