The Sculptures of Oskar J.W. Hansen at Hoover Dam (1936–1938)

Hansen’s Sculptures at Hoover Dam

Oskar J.W. Hansen created six sculptures at Hoover Dam between 1936 and 1938—two massive bronzes, a terrazzo star map, a zodiac compass, two memorial plaques, and ten bas-relief panels across the dam’s elevator towers. Together they form what’s known as Monument Plaza. One artist designed all of it.

Most visitors come for the Winged Figures of the Republic. I did too, the first time. Two 30-foot bronzes flanking a flagpole at the Nevada entrance—they’re the photo op, the thing you’ve seen before you arrive. But stand between them and look down. The terrazzo beneath your feet is a map of the night sky on September 30, 1935, the evening Franklin Roosevelt dedicated the dam. The Smithsonian Institution and U.S. Navy helped Hansen plot it. It required over 200,000 astronomical calculations and tracks the precession of the equinoxes across roughly 26,000 years.

The rest of the plaza works the same way. The Workers Memorial Plaque names the 96 men who officially died during construction. The Elevator Tower Bas-Reliefs tell two parallel stories on the dam’s flanking towers—one about what the dam does (flood control, irrigation, power), one about whose land it transformed (the Indigenous peoples of the Colorado River). The Hoover Dam Star Map tracks 26,000 years. Next to that, the dam is recent. Hansen didn’t treat any of these as separate commissions. They’re all part of the same program.

Hansen was explicit about what he was doing. He wanted Monument Plaza to be readable by a civilization that might find these works thousands of years from now, long after the dam and the nation that built it were gone. The closest comparison isn’t other 1930s public art. It’s something more like Stonehenge—architecture that serves both a ceremonial and an astronomical function.

The timeline still surprises me. Hansen was appointed consulting sculptor in 1936. By December 17, 1937, it was done—the bronzes, the terrazzo, the bas-reliefs, the memorials. He wasn’t a contractor executing someone else’s design. He was the only artistic mind behind every element on the plaza. The deeper I’ve gone into the archival record, the clearer that becomes. There was no committee. This is one person’s vision of what the dam meant.

Oskar Hansen’s Vision for Hoover Dam

The Bureau of Reclamation selected Hansen through a design competition in the early 1930s and then let him do something unusual. Hansen wasn’t handed a specification sheet and told to build a monument. He proposed the entire program—the Winged Figures, the Star Map beneath them, a Zodiac Compass anchoring the celestial coordinates to physical orientation, memorials to the workers and to Elwood Mead, bas-reliefs on both elevator towers—and the Bureau accepted it. The sculptures at Hoover Dam reflect Hansen’s idea of what the dam meant, not the government’s.

You can see the result in how the pieces relate to each other. The Winged Figures sit on top of the Star Map. The Zodiac Compass orients the Star Map to the physical plaza. The workers memorial and the Mead memorial sit within the same space as the astronomical work. None of that happens when a committee designs by consensus or when multiple artists contribute separate pieces. Monument Plaza is coherent because one person controlled all of it.

Hansen was a Norwegian immigrant with classical sculpture training and a track record of public commissions in the Chicago area. He had a serious interest in astronomy—serious enough to coordinate 200,000 calculations with the Smithsonian and U.S. Navy to get the Star Map right. His pamphlet Sculptures at Hoover Dam is worth reading if you can find it. It shows someone thinking about art, science, and symbolism as the same project, not separate ones. (I’ll write about the pamphlet in more detail separately. The story of how Hansen got this commission has its own surprises that I’m still working through.)

One thing worth clarifying: this wasn’t a WPA project. The Bureau of Reclamation ran its own procurement, separate from the Depression-era arts programs that were placing artists across the country. But the broader context matters. The federal government was commissioning public art at unprecedented scale during the 1930s, and Hoover Dam was the highest-profile construction project in America. For a sculptor, there was no bigger job.

The Six Works

Here’s what’s on the plaza. Each sculpture has its own dedicated page with the full research—these are overviews.

Winged Figures of the Republic

Two 30-foot bronzes flanking a 142-foot flagpole at the Nevada entrance, cast from over four tons of metal on polished black diorite bases. The Winged Figures of the Republic are the ones everyone recognizes—Hansen’s most photographed work. Visitors have rubbed their toes to a golden sheen, a tradition with no documented origin I’ve been able to find. Hansen described them as representing “mankind itself.” Not specific workers or heroes. The collective capacity that made the dam possible.

The Star Map

A terrazzo floor inlaid with brass markers plotting the positions of stars and planets on September 30, 1935—FDR’s dedication date. The Hoover Dam Star Map was designed with the Smithsonian Institution and U.S. Navy, required over 200,000 calculations, and tracks the precession of the equinoxes across roughly 26,000 years. It was demolished in 2022 for structural repairs and finally restored and reopened in January 2026 after a troubled three-year process. This is the work that changed how I understood everything else Hansen did at the dam.

Zodiac Compass

A compass rose framed by zodiac symbols, positioned near the Winged Figures. The Zodiac Compass connects the Star Map’s celestial coordinate system to physical orientation on the ground. It’s easy to walk past, but it’s the piece that ties the Star Map’s astronomy to the plaza you’re standing on.

Workers Memorial Plaque

Inscribed “They died to make the desert bloom,” the Workers Memorial Plaque honors the 96 workers officially killed during construction. Hansen’s low-relief bronze depicts a muscular figure emerging from waves, flanked by lightning, grain, and vegetation. The official death toll of 96 is itself a contested number—more on that on the memorial’s dedicated page.

Elwood Mead Memorial

A tribute to Elwood Mead, Commissioner of the Bureau of Reclamation during the dam’s construction and the man Lake Mead is named for. The Elwood Mead Memorial is the quietest piece in the program, but Hansen included it deliberately—Mead’s vision for western water management is part of why the dam exists.

Elevator Tower Bas-Reliefs

Ten concrete panels across the dam’s two elevator towers. The Nevada tower’s five reliefs depict the dam’s multipurpose benefits: flood control, navigation, irrigation, water storage, power. The Arizona tower’s five reliefs depict Native American tribes, with an inscription acknowledging Indigenous peoples’ connection to the Colorado River region. Most visitors don’t notice the Elevator Tower Bas-Reliefs at all, which is unfortunate—they’re telling two very different stories about the dam on opposite sides of the canyon.

What Hansen Was Actually Trying to Do

The six sculptures aren’t separate projects that happen to share a location. Hansen designed them as a single program. Each one addresses a different aspect of the dam—who built it, what it cost, what it does, whose land it sits on, and where it falls on an astronomical timeline—but they work together. Monument Plaza is the name for the whole thing.

Hansen called the dam “a monument to the collective genius exerting itself in community efforts around a common need or ideal.” That phrase—collective genius—shows up in his pamphlet Sculptures at Hoover Dam, and it explains a lot about his choices. The Winged Figures represent collective human capacity. The Star Map places the dam on a cosmic timeline. The workers memorial records what it cost in lives. The Mead memorial acknowledges who directed it. The bas-reliefs document what it does and whose land it sits on. Every piece does something different, but they’re all answering the same question: what does this dam mean?

The Art Deco design language matters here too. Hansen adopted the movement’s belief that art, science, and industry belonged together. You can see it in the musculature of the Winged Figures, the geometric precision of the Star Map, the stylized vegetation on the bas-reliefs. All of it is 1930s work, but Hansen explicitly designed it to be readable by civilizations in the distant future. The Star Map is the most obvious example—a 26,000-year clock built into the floor—but the whole program was designed with that kind of permanence in mind.

Visiting Hansen’s Sculptures Today

All six of Hansen’s Hoover Dam sculptures are accessible to visitors as of January 2026, when Monument Plaza reopened following a three-year restoration of the Star Map terrazzo. The Winged Figures, Zodiac Compass, memorials, and bas-reliefs were viewable throughout most of that period, but the Star Map was behind construction fencing from mid-2022 until the reopening.

The Star Map restoration deserves its own telling—and it has one, on our Star Map restoration update page. The short version: in summer 2022, the Bureau of Reclamation demolished the original terrazzo to address the drainage system underneath. Necessary work, but it meant destroying Hansen’s floor to save it. Then the project stalled. The original contractor’s work was terminated. The plaza sat as a gated construction site for over a year. Work restarted slowly in 2024. The terrazzo was finally restored and the gates came down in January 2026.

We tracked the whole process through our Save the Star Map campaign, which pushed for transparent communication from the Bureau and drew coverage from the Las Vegas Review-Journal and Boulder City Review. The experience reinforced something I already suspected: Hansen’s work at the dam doesn’t have a natural institutional champion. The Bureau manages the infrastructure. Nobody specifically manages the art.

If you’re planning a visit: the Winged Figures and Star Map are at the Nevada entrance to the dam. The elevator tower bas-reliefs are visible from the roadway across the dam’s crest. The workers memorial and Elwood Mead memorial are in the plaza area. No separate admission—standard Hoover Dam access covers everything.