The U.S. Strategic Petroleum Reserve has dropped to its lowest level since 1983 after back-to-back presidential drawdowns drained 352 million barrels in four years, and federal auditors warn the aging system may not survive another large-scale release.
Government inventories fell by 3.7 million barrels last week to roughly 308 million barrels, less than half the reserve's 714-million-barrel authorized capacity. The decline follows President Trump's March order to release 172 million barrels after Iran choked off oil exports through the Strait of Hormuz, triggering what CNBC reported as the largest supply disruption in history. Energy Information Administration projections show the reserve falling to approximately 243 million barrels once that release is fully executed.
The numbers alone are alarming. But the real problem sits thousands of feet underground on the Gulf Coast, where 60 salt caverns built decades ago are showing their age, and where Department of Energy officials have admitted, in blunt language, that the fixes holding things together may not last.
A Government Accountability Office report published in May laid out the damage in detail. The GAO concluded that more than a quarter of the SPR "was not available for drawdown due to a combination of construction outages and cavern outages." Rapidan Energy, in a July analysis, translated that finding into a hard number: at least 103 million barrels sitting in the reserve today cannot be deployed.
The GAO's language left little room for optimism. The report, filed as GAO-26-106918, stated plainly:
"The SPR's drawdown, distribution and fill capabilities are currently limited and are at risk going forward due to longstanding issues with aging infrastructure compounded with ongoing major construction intended to address them."
DOE officials told auditors the infrastructure is being held together "with 'Band-Aids,' and that it is uncertain how long they will hold." That is not the assessment of an outside critic. It came from the people responsible for operating the system.
The reserve works by pumping water into the bottom of massive salt caverns to push crude oil to the surface and into pipelines. The process puts enormous stress on wells, pumps, and pipes, equipment that has now endured two historically large drawdowns in rapid succession.
The current strain did not begin with Iran. President Biden ordered 180 million barrels released from the SPR in response to Russia's invasion of Ukraine in 2022, the largest single release in the reserve's history. Federal auditors found the operation was completed "without major equipment failures or crude oil spills," but added that "doing so was operationally challenging."
Auditors described Biden's drawdown as an "unplanned stress test of the SPR's operational capabilities." The release required what the GAO called "triaging of emergency repairs" as water pumps and pipes began leaking under the load. Energy officials told auditors the experience "also highlighted risks to the SPR's capability to repeat a drawdown of similar speed and scale to the 2022 drawdown if directed to do so in the near future."
That warning landed before Trump's 172-million-barrel order. The reserve is now being asked to do exactly what federal officials said it might not be able to handle, deliver another massive drawdown on top of infrastructure already strained past its limits.
The Strait of Hormuz crisis that prompted Trump's order left the administration with few good options. Iran's disruption of global oil flows demanded a response, and the SPR exists for precisely this kind of emergency. The question is whether the reserve can physically deliver what the president ordered.
The Department of Energy has a $1.4 billion plan to repair SPR infrastructure. But the agency has already narrowed the scope of that project to stay within budget, meaning the full range of needed repairs will not be completed even if everything goes according to the revised plan.
A DOE spokesperson told CNBC that the operational minimum needed to safely manage the caverns "is around ten percent of capacity, about 70 million barrels." Federal law does not mandate a minimum operating level for the reserve, a gap that means there is no legal floor preventing the SPR from being drawn down to the point where safe cavern management becomes impossible.
If the EIA projection holds and inventory falls to 243 million barrels, the reserve will still sit above that 70-million-barrel operational minimum. But with 103 million barrels already classified as not deployable by Rapidan Energy's analysis, the effective cushion is far thinner than the headline number suggests. The math is straightforward: 243 million barrels minus 103 million barrels that cannot move leaves roughly 140 million barrels of usable supply, in a system designed to hold 714 million.
Drivers are already feeling the consequences of tighter global supply. Record domestic production has not been enough to shield consumers from prices driven by international disruptions and shrinking reserves.
David Goldwyn, who served as the State Department's special envoy for international energy affairs under President Obama, offered a more measured assessment. "I'm not worried about the stability of the reserve or our ability to do another drawdown," Goldwyn said.
But he acknowledged the toll repeated releases take on aging equipment:
"Every time when you do a drawdown, you accelerate the degradation of the wells themselves and some of the equipment. It's like anything else, you use it a lot, you've got to maintain it."
Goldwyn's confidence and the GAO's warnings are not necessarily contradictory. The reserve may well survive another drawdown without a catastrophic failure. The auditors' concern is that each release makes the next one riskier, and that the window for repairs is closing as the infrastructure degrades faster than the government can fix it.
The Trump administration has moved on multiple fronts to address energy prices, including ordering the DOJ to investigate oil companies over potential price gouging. But no enforcement action or market probe can substitute for a functioning strategic reserve when the next supply shock arrives.
Congress established the Strategic Petroleum Reserve in 1975, two years after the Arab oil embargo demonstrated how vulnerable the American economy was to foreign energy disruptions. The reserve was built to be the nation's insurance policy, a massive stockpile of crude that could be released to stabilize markets and protect consumers when global supply chains broke down.
For decades, that insurance policy worked because it was rarely used. The salt caverns held hundreds of millions of barrels in reserve, and the infrastructure stayed functional because it was not under constant operational stress. That changed in 2022, and it changed again in 2026.
The surge in oil prices driven by Iran's actions through the Strait of Hormuz created a genuine emergency. Biden's earlier release in response to the Ukraine war addressed a genuine emergency too. Neither president acted without cause. But the cumulative effect of 352 million barrels leaving the system in four years, through infrastructure that was already aging and underfunded, has left the country's energy safety net in a condition that federal auditors describe in terms normally reserved for equipment on the verge of failure.
Band-Aids, triaged repairs, leaking pumps, narrowed budgets, and a quarter of the reserve offline. That is the state of America's emergency oil stockpile at a moment when global energy markets remain volatile and inflation pressures continue to weigh on household budgets.
The SPR was built so the country would never be caught without options. Right now, the options are draining out faster than anyone is putting them back.