Hoover Dam Star Map Restoration Is Finally Complete

After more than three years of delays, stalled contracts, bureaucratic silence, and genuine fear that one of America’s most extraordinary public artworks might be lost forever, the Hoover Dam Star Map restoration was completed a few weeks ago, and the Monument Plaza is reopened to visitors.

The terrazzo masterpiece designed by sculptor Oskar J. W. Hansen in the 1930s is back. And with it, our “Save the Star Map” campaign has reached its conclusion.

I’ll be honest: I’m relieved. But I’m also frustrated. The restoration itself is something to celebrate — the artwork has been meticulously rebuilt and will again be seen by the millions of people who visit Hoover Dam every year. That matters enormously. But the path to get here was far longer, far more opaque, and far more reckless with an irreplaceable piece of American heritage than it ever needed to be.

What Is the Hoover Dam Star Map?

For those encountering the Star Map for the first time: it’s the terrazzo floor at the base of Hansen’s massive Winged Figures of the Republic bronze statues on the Nevada side of Hoover Dam, in the area known as Monument Plaza.

But calling it a “floor” significantly understates it.

Oskar Hansen designed the terrazzo as a celestial map, a 26,000-year astronomical “clock” that tracks the “precession of the equinoxes,” the fascinating astronomical and astrological fact that because of the subtle tilt and wobble of the Earth’s axis, over the course of every 2,166 years the position of the Zodiac constellations in the sky shift one at a time in a full circle, creating each “Zodiacal Age” (ie, the Age of Pisces or the Age of Aquarius). Using the complex mapping of this 26,000-year star cycle, and a precise placement of its stars and planets, Oskar Hansen designed a perpetual “clock” that could be used for thousands of years to pinpoint the exact moment President Franklin Delano Roosevelt dedicated the Hoover Dam on September 30, 1935.

Oskar’s design required over 200,000 manual stellar calculations performed by Hansen in collaboration with the Smithsonian Institution and the U.S. Naval Observatory. Hundreds of brass discs are embedded in the terrazzo, each representing a celestial body visible to the naked eye on that day in 1935.

The Star Map doesn’t just record a date. It places the construction of Hoover Dam—which Oskar considered among humanity’s greatest engineering achievements, comparable to the Egyptian pyramids—on a cosmic timeline. Future civilizations, even without any other historical record, could examine the Star Map and calculate the exact date the dam was dedicated. Hansen wanted the monument to speak across millennia, and he built it to do exactly that.

For a full technical explanation of how precession mechanics work, Alexander Rose’s Long Now Foundation article and Wally Motloch’s Graham Hancock post are the best available resources.

The Star Map and the Winged Figures of the Republic statues above it have been some of the most photographed and visited artworks in the American West for nearly ninety years. It is, as far as I’m aware, the most visited terrazzo sculpture in the world.

How the Restoration Went Wrong

The Star Map needed restoration. That was never in dispute.

Though Oskar Hansen designed his original Star Map terrazzo with the hope that it would survive for generations (or even millennia), soon after its installation, during World War II, Hoover Dam was identified as a potential war target and was heavily fortified for a possible attack. A defensive gun bunker is still visible on the clifftop on the Arizona side of the dam. It’s my understanding that the Star Map was covered in sand so machine guns could be mounted on top of the dam.

This sand covering trapped significant moisture on the terrazzo, leading it to deteriorate rapidly.

By 1958, an installation meant to last the test of time was already in need of its first complete restoration. Terrazzo artist Julius Bartoli was hired to remove and replace Oskar’s original Star Map, with Oskar serving as a project consultant. Despite Bartoli’s skill as an artist, both he and Oskar exacerbated the terrazzo installation’s underlying engineering flaws, and the 1958 installation also lacked sufficient drainage channels to remove water from the terrazzo.

60 years later, after decades of desert weather and millions of footsteps, these fundamental drainage design flaws had caused the terrazzo to buckle and deteriorate again. By the 2020s, a comprehensive fix was overdue.

In early 2022, the Bureau of Reclamation (“BOR”) launched a full restoration of Monument Plaza. The plan called for sandblasting and resurfacing the Winged Figures statues and—more critically—the complete demolition and rebuilding of the Star Map terrazzo, including installation of a new drainage system underneath. I was brought on by the government’s contractor to advise on the history of Oskar’s artwork.

The statues were restored relatively quickly. By spring 2022, the Winged Figures had been sandblasted and given a new patina. That part of the project went fine.

The Star Map was a different story.

In the summer of 2022, the terrazzo was completely demolished. The brass-inlaid artwork that Hansen, the Smithsonian, and the Naval Observatory had spent years calculating and constructing was jackhammered out of the ground and removed. This was expected—the plan always required full demolition to fix the drainage—but it meant the artwork existed only in documentation and in the hands of the terrazzo artists contracted to rebuild it.

And then the project stopped.

Almost immediately after the demolition, the restoration stalled. The BOR entered into a prolonged dispute with the original contractor over findings regarding site conditions beneath the terrazzo. For months, nothing happened. The contractor was effectively shut down, unable to work on this or any other projects while awaiting government approval of a revised scope of work. The BOR requested that my access to project information be rescinded as they began shutting down the project and its communication channels.

By mid-2023 — nearly a full year after the terrazzo was destroyed — no meaningful reconstruction work had been done. Monument Plaza remained barricaded. The expert terrazzo artists hired to rebuild the Star Map risked becoming unavailable if the delay stretched further. Between COVID-era closures starting in March 2020 and the stalled restoration, tourists hadn’t seen the Star Map in over three years.

The “Save the Star Map” Campaign

By the summer of 2023, I was genuinely afraid the Star Map might not come back.

That’s not hyperbole. The project had been stalled for nearly a year. The government wasn’t communicating. The terrazzo had been destroyed and was sitting in storage. The specialized artists needed to rebuild it were waiting in limbo. Every month of delay increased the risk that the expertise, institutional knowledge, budget, and political will needed to finish the job would evaporate.

So I launched the “Save the Star Map” campaign.

My goal was straightforward: raise public awareness of the stalled restoration, apply pressure on the Bureau of Reclamation to resume work, and document the situation so there would be a public record regardless of the outcome.

The response was better than I expected. Las Vegas television station 8NewsNow ran multiple segments covering the stalled restoration. The Las Vegas Review-Journal and the Boulder City Review covered the campaign. People who cared about Hoover Dam, about public art, and about government accountability in historic preservation wrote in and spread the word.

Regardless of whether the BOR felt pressure from my campaign, the campaign served its purpose. It created a public record. It gave people who cared about the Star Map a way to express that concern. It made clear that someone was watching and would continue to watch until the restoration was complete.

I want to be precise about what frustrated me, because it wasn’t that a complex restoration project encountered complications. That happens. Construction projects encounter surprises, especially when you’re working on a structure built in the 1930s on top of one of the largest dams in the world. What frustrated me was the response to those complications: a lack of transparency, urgency, and any apparent plan.

The Bureau of Reclamation is the custodian of a national landmark artwork visited by millions of people a year. When that artwork is demolished, and the rebuild stalls, the responsible thing to do is to communicate clearly about what went wrong, the revised timeline, and the path forward. Instead, for the better part of a year, we got silence. No public updates. No timeline. No accountability.

The irony was hard to miss. Hansen created the Star Map to celebrate what he saw as proof that human beings are capable of extraordinary collective achievement when they commit to solving hard problems. Hoover Dam was built ahead of schedule and under budget during the Great Depression. Ninety years later, a contract change order negotiation was enough to leave his artwork in pieces.

Construction Restarts

Eventually, the original contractor relationship was terminated. A new contractor was brought on in 2024, and limited work, pouring a new cement base and installing the new drainage system, began. Finally, by the summer of 2025, Mike Payne, the original terrazzo artist hired in 2022 to replace the Star Map, began installation, a full three years after the original plans.

My daughter and I visited in October and saw Payne’s team working hard on the terrazzo.

That work took months, and because the BOR refused to communicate with me during this time, I have limited details on how that phase went. By December 2025, the Star Map installation was complete, and Monument Plaza was reopened to the public for the first time since March 2020.

The Star Map Is Saved

With the restoration complete and the Star Map back in place at Monument Plaza, our “Save the Star Map” campaign is now formally concluded.

I’m grateful to everyone who supported the effort — the journalists who covered the story, the readers who shared it, the preservation advocates who amplified it, and the members of the public who contacted the Bureau of Reclamation to express their concern. Larry Bartoli, whose father Julius performed the 1958 restoration, drove from Texas to Nevada to offer the government his family’s institutional knowledge. Dozens of others contributed in ways large and small.

Wayne Wilson, the original contractor, continues to face significant unpaid invoices, and the government still refuses to communicate with him. This project has quite literally devastated him.

I want to be clear-eyed about the outcome. The Star Map is restored, and that is genuinely worth celebrating. The artwork will again be experienced by millions of visitors for decades to come, and the new drainage system should (hopefully) prevent the deterioration cycle that necessitated multiple prior restorations. That is a good result.

But it should not have taken this long. Visitors were locked out of Monument Plaza for almost six years—from March 2020 COVID closure through restoration completion at the end of 2025. The Bureau of Reclamation’s lack of transparency and urgency during the stall period put an irreplaceable artwork at unnecessary risk. None of that should be forgotten, because the next time a historic landmark under federal stewardship needs restoration, the responsible agencies should do better.

The Star Map was designed to endure for thousands of years. The fact that it almost didn’t survive a government contract dispute should concern anyone who cares about the preservation of America’s public art and historic landmarks.

What’s Next for the Oskar J. W. Hansen Archives

The Star Map campaign may be over, but our work at the Oskar J. W. Hansen Archives is far from finished.

Over the past several years, while the restoration drama played out, we’ve continued our core mission: researching and documenting the life and art of one of the most fascinating and overlooked American sculptors of the 20th century.

Recent discoveries have been remarkable. We found a long-lost audio recording of Hansen — the first known recording of his voice. We located his missing “Head of Christ” bust in Montana. We tracked down his iconic Wings II statue to a private home in Richmond. Each discovery adds another piece to the puzzle of a man who claimed his father was the King of Norway, who said he studied with Rodin, and who built a 26,000-year clock into the floor of one of the world’s great engineering marvels.

The Star Map is saved. Oskar’s story is still being written.