KVIG Informative

The Bureau of Reclamation published the Final Environmental Impact Statement for the Colorado River’s two biggest reservoirs on July 31, 2026, selecting a preferred plan meant to guide river operations for a decade, through 2036. The dam built to enforce the water-allocation deal behind all of it carries the name of the man credited with brokering that 1922 deal — a name that spent more than a decade erased from federal paperwork before Congress voted to put it back.

Construction on the dam in Black Canyon began on Sept. 30, 1930, and Interior Secretary Ray Lyman Wilbur ordered that day that the structure be called Hoover Dam, according to the Bureau of Reclamation’s own history of the dam’s name. Congress made that name official in an act approved Feb. 14, 1931, the agency’s history says.

After Herbert Hoover lost his 1932 re-election bid, the names Boulder Canyon Dam and Boulder Dam came into common use instead. The Bureau of Reclamation’s history attributes the switch to the incoming secretary of the interior’s dislike of Hoover, while noting that the dam’s name was never officially changed from Hoover. That incoming secretary was Harold Ickes, who on May 8, 1933, directed the Bureau of Reclamation in a memo to refer to the structure as Boulder Dam in its pamphlets and other correspondence going forward, according to a National Archives blog post published by the Herbert Hoover Presidential Library.

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Hoover’s connection to the dam predated his presidency. As secretary of commerce, he presided over the 1922 negotiations among seven states that produced the Colorado River Compact, signed Nov. 24, 1922, which allocated the river’s water between the upper and lower basins and settled what a later congressional resolution called a 25-year-old dispute, according to the Bureau of Reclamation’s history. The Boulder Canyon Project Act, enacted Dec. 21, 1928, when Hoover was president-elect, ratified that compact and authorized a dam in either Black Canyon or Boulder Canyon, leaving the site choice to the secretary of the interior. The act was proclaimed in effect June 25, 1929, and required federal officials to line up power and water contracts worth roughly $200 million in revenue before construction could begin, the same source says.

By the time Hoover left office in March 1933, construction had been pushed more than a year ahead of schedule, and congressional appropriations acts had named the dam in his honor five times, according to the Bureau of Reclamation’s history.

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Momentum to reverse the switch built in the 80th Congress. California Rep. Jack Anderson introduced House Resolution 140 on March 4, 1947, according to a National Archives blog post published by the Herbert Hoover Presidential Library. The House passed the resolution two days later, on March 6, 1947, and the Senate passed a companion resolution on April 23, 1947, according to the Bureau of Reclamation’s history. President Harry Truman signed the joint resolution on April 30, 1947, restoring Hoover’s name to the dam and specifying that any federal law, regulation, document or record that referred to the structure as Boulder Dam would thereafter be read as referring to it as Hoover Dam, the agency’s history says.

The resolution’s text, reproduced in the Bureau of Reclamation’s history, noted that Congress itself had already used the name Hoover Dam in acts approved in 1931, twice in 1932, and again in February 1933 — the same years federal officials were steering public references toward Boulder Dam instead.

The water-rights math behind Hoover’s name fight is the same math the Interior Department just spent three years and review of more than 18,000 public comments trying to update, because the river never carried the water the 1922 compact assumed it would. The compact divided 7.5 million acre-feet of water between the two basins based on a pre-compact average inflow of about 18 million acre-feet measured from 1906 to 1921, according to a Department of the Interior release issued July 31, 2026. Actual inflows from 2000 through 2024 have averaged only 12.9 million acre-feet, the release says, and combined storage in Lake Powell and Lake Mead — the reservoirs the dam’s name fight was fought over — is at its lowest point since before Glen Canyon Dam began filling in 1963. Whatever operating rules replace the ones now expiring won’t be decided by whose name sits on the dam. They’ll be decided by whether a river apportioned on 1922 math can still deliver what that math promised.