Yucca Mountain is a ridge in southwestern Nevada that was selected by the U.S. government as the country’s sole permanent repository for high-level nuclear waste and spent nuclear fuel. The project, if built, would store up to 70,000 metric tons of radioactive material in tunnels carved roughly 1,000 feet below the mountain’s surface and about 1,000 feet above the water table. Despite decades of study and billions of dollars spent, the repository has never been constructed and remains one of the most politically contentious infrastructure projects in American history.
Why the U.S. Needs a Repository
Nuclear power plants and defense operations have been generating radioactive waste since the 1940s. Today, more than 70,000 metric tons of spent nuclear fuel sit in temporary storage at over 77 reactor sites across the country, with roughly 2,000 additional tons produced each year. These sites were never meant for long-term storage. Spent fuel rods remain dangerously radioactive for tens of thousands of years, so the federal government committed to finding a permanent underground home where the waste could be isolated from people and the environment essentially forever.
The basic concept is called geologic disposal: packaging radioactive material in engineered containers and burying them deep inside stable rock, where natural and man-made barriers work together to prevent contamination from reaching groundwater, soil, or the surface.
How Congress Chose Yucca Mountain
The Nuclear Waste Policy Act of 1982 directed the Department of Energy to evaluate multiple sites across the country for a permanent repository. By 1986, the DOE had recommended Yucca Mountain as a candidate, and in 1987, Congress passed the Nuclear Waste Policy Amendments Act, which eliminated all other candidates and focused the entire program on this single Nevada location. The law required the DOE to phase out site-specific activities at every other candidate within 90 days.
Nevada had no real say in the decision. The 1987 amendment became known informally as the “Screw Nevada Bill” because it singled out the state without its consent. That resentment has shaped the project’s politics ever since.
The Geology of the Site
Yucca Mountain is made up of volcanic tuff, a type of rock formed from compacted ash ejected by eruptions millions of years ago. The specific layer chosen to host the repository is called the Topopah Spring Tuff, sitting about 280 meters (roughly 920 feet) below the mountain’s crest. This rock varies in density and porosity depending on how intensely it was compressed and heated after the original eruption, a property called welding. Densely welded tuff is hard and has low porosity, which limits how easily water can move through it.
Supporters of the site argued that this dry, remote desert location, combined with the thick layer of rock above and below the tunnels, would keep waste safely isolated. The repository would sit in the unsaturated zone, meaning the rock between the surface and the water table, where pores are only partially filled with moisture rather than fully submerged in groundwater.
What the Repository Would Hold
Federal law caps the repository at 70,000 metric tons unless a second facility opens. According to DOE planning documents, that capacity would break down to approximately 63,000 metric tons of commercial spent nuclear fuel from power plants, 2,333 metric tons of defense-related spent fuel, and 4,667 equivalent metric tons of high-level radioactive waste from weapons production.
Even at full capacity, the repository wouldn’t solve the entire problem. By the time it could be filled, the nation’s reactor sites would still hold roughly the same amount of waste they have now, given ongoing power generation. The statutory limit was always a starting point, not a final answer.
Nevada’s Opposition
The State of Nevada has fought the project on nearly every front: scientific, legal, and political. The Nevada Attorney General’s office has laid out several core objections.
- Geology and seismic risk. Nevada argues the site is volcanically and seismically active, with porous rock that cannot reliably contain waste. Researchers have studied whether earthquakes could push the water table up by 100 to 200 meters, potentially flooding the repository tunnels. The site’s aquifer also drains into the Amargosa Valley, one of the state’s most productive agricultural regions.
- Proximity to population. Las Vegas, the state’s largest metro area, sits only about 90 miles away. Nellis Air Force Base is adjacent to the site and growing.
- Transportation danger. Moving 70,000 metric tons of radioactive material across the country would require enormous logistics. Under a “mostly truck” scenario, the DOE projected roughly 109,000 shipments over 38 years, averaging about eight trucks per day. A rail-heavy approach would still mean around 22,000 to 45,000 shipments. Proposed routes pass through 703 counties in 44 states, near an estimated 123 million people. Nevada officials have argued that each shipment represents a potential target for accidents or terrorism.
- Insufficient capacity. Even filled to its legal limit, the repository wouldn’t eliminate the need for on-site storage at reactors nationwide.
Western Shoshone Land Claims
Yucca Mountain sits within territory that the Western Shoshone people have claimed as their homeland for centuries. The 1863 Treaty of Ruby Valley, signed between the Western Shoshone and the United States, defined the boundaries of Shoshone country across a vast stretch of Nevada and neighboring areas. The treaty allowed certain activities like road building and mining on the land but did not include a clear cession of the territory itself. The Western Shoshone have long argued that the treaty never transferred ownership of the land to the federal government, making the repository project a violation of their sovereign rights. The U.S. government has treated the matter as settled, but it remains a significant point of contention for tribal nations.
Where the Project Stands Now
The Yucca Mountain repository has been in a state of political limbo for over a decade. The Obama administration effectively defunded the project in 2010, and the DOE withdrew its license application from the Nuclear Regulatory Commission. The NRC later completed portions of its safety review but never issued a final decision.
The federal government still spends money on the site, but only for maintenance, not construction. The DOE’s fiscal year 2024 budget requested about $12 million from the Nuclear Waste Fund for security at the site, upkeep of legacy data systems, legal services, and staffing. That figure has crept up from $7.5 million in 2022, largely to cover data management costs. Projections for 2025 and 2026 hold steady around $12 to $13 million annually.
Meanwhile, nuclear utilities and their ratepayers have paid over $40 billion into the Nuclear Waste Fund through fees on electricity bills, money originally earmarked for building the repository. Spent fuel continues to accumulate at reactor sites in more than 30 states, stored in pools and dry casks that were designed as temporary solutions. No alternative permanent repository has been authorized, and no serious legislative effort to restart or replace the Yucca Mountain project has gained enough support to move forward. The country’s nuclear waste problem remains, for now, exactly where it has been for decades: unresolved.