HauntBound archive · catalog record
Reported phenomena — as catalogued
Depression-era engineering landmark where 96 documented worker deaths shaped the Colorado River — and an eerie father-son fatality bookends the build
Hoover Dam Access Rd, Boulder City, NV 89005
Research updated June 2026
Age
All Ages
Cost
$$
Visitor Center admission and Guided Power Plant Tour fees apply; Guided Dam Tour sold on-site only
Access
Wheelchair OK
Paved walkways; interior tours involve elevator and stairways
Equipment
Photos OK
Est. 1935 · Great Depression Labor History · New Deal Infrastructure · Colorado River Engineering · Worker Memorial
Congress authorized the Boulder Canyon Project Act in 1928, and construction contracts were awarded in 1931. At the time, it was the largest dam construction project in American history, requiring the excavation of two diversion tunnels totaling 3.5 miles in length to redirect the Colorado River before the main structure could be built.
Six Companies Inc., a consortium of construction firms, employed a peak workforce of approximately 5,251 men in a single day at the height of construction. Workers came from across the United States, many desperate for work during the Depression's worst years. They lived in the government-built Boulder City nearby, a planned community constructed specifically for dam workers.
The Bureau of Reclamation's official count of 96 construction deaths covers falls from structures, drowning in the Colorado, dynamite accidents, and equipment failures. The first recorded death was J.G. Tierney, a surveyor who drowned in the Colorado River on December 20, 1922, during the project's early survey phase. The last recorded death was his son, Patrick Tierney, who died on December 20, 1935 — exactly 13 years later — during the final construction phase. This coincidence was noted in contemporary newspaper coverage and has remained part of the dam's documented history.
Historians and occupational health researchers have argued the official count undercounts the actual toll, particularly deaths attributed to heat stroke and pneumonia from carbon monoxide exposure in the diversion tunnels. The Bureau's criteria for classification as a construction death excluded many fatalities that occurred off-site or were attributed to illness rather than direct accident.
Sculptor Oskar Hansen's bas-relief memorial, dedicated in 1935, stands at the dam's Nevada side. It depicts two winged figures and includes a star map commemorating the dam's completion date. The memorial is a standard stop on Bureau of Reclamation tours.
Sources
Hoover Dam's most frequently cited dark legend — that workers' bodies were poured into the concrete — was directly addressed and refuted by the Bureau of Reclamation, which maintains records showing the concrete was poured in carefully controlled lifts that would not have concealed a body. No evidence of the entombment story has been found in construction records.
What is documented is the father-son story: J.G. Tierney, a Bureau of Reclamation employee, drowned on December 20, 1922, during pre-construction survey work. His son, Patrick Tierney, was employed as a worker on the dam and died on December 20, 1935, the last fatality formally attributed to the project. Contemporary accounts in the Las Vegas Review-Journal confirmed both deaths and the date coincidence; it was not a legend that accrued over time but a fact that was noted in 1930s newspaper coverage.
Paranormal accounts associated with the dam's interior tunnels include reports of shadowy figures in the generator hall during off-hours, unexplained sounds in the diversion tunnels, and an ambient sense of confinement that some visitors interpret as a residual trace of the thousands of men who worked underground in dangerous conditions for five years. No formal paranormal investigation has been published, and the Bureau of Reclamation does not acknowledge or promote any supernatural aspects of the site.
The Hansen memorial, with its star map and winged figures, has generated its own interpretive tradition — the wings are sometimes described as the spirits of departed workers rather than the Art Deco abstraction Hansen intended. The memorial is secular in intent but sacred in effect, and visitors often treat it as such.
Notable Entities
Bureau of Reclamation-operated tour through the dam's interior, including the generator hall and observation areas. Tickets can be purchased in advance; see the Bureau of Reclamation's Hoover Dam website for the current ticketing link.
Explore the visitor center exhibits covering dam construction, the Great Depression labor history, and the Oskar Hansen bas-relief memorial commemorating the workers who died during construction. The memorial was dedicated in 1935.
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