US Strategic Petroleum Reserve Falls Below 300M Barrels, Lowest Since 1983

The US Strategic Petroleum Reserve has fallen below 300 million barrels for the first time since it was being filled in the early 1980s, marking a multi-decade low as global crude supply stays squeezed by the Iran war. The SPR fell by 6.1 million barrels to 298.7 million barrels last week, according to data released by the Department of Energy on Monday, the lowest level since January 1983.

What the data shows

The 6.1 million drain was a big jump from the prior week's 2.8 million barrel outflow, the biggest weekly draw in almost two months, suggesting US reserves are once again working overtime to prevent the oil price from spiking.

The SPR stood at around 415 million barrels before the US and Israel attacked Iran on Feb. 28, and government stocks are projected to fall to around 243 million barrels when the release Trump ordered is completed.

How we got here

President Trump ordered the release of 172 million barrels in March after Iran choked off oil exports through the Strait of Hormuz. The drawdown is part of a coordinated IEA action, though the US has done the heavy lifting.

The current SPR action works through a lending mechanism rather than outright sales: the government releases crude to companies that must return the same volume plus a premium later, with the Department of Energy contracting out more than 133 million barrels and repayment premiums running as high as 28% on individual deals.

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Operational risk under the surface

The headline number understates the problem. The SPR's operational capability is at risk due to aging infrastructure, according to a May report from the Government Accountability Office, which found more than a quarter of its inventory was not available for drawdown due to construction and cavern outages as of December 2025.

That implied that a minimum of 103 million barrels in the SPR today are not available for use, according to a July analysis by Rapidan Energy. The reserve remains above its statutory minimum of 252.4 million barrels, which restricts certain limited drawdowns under the Energy Policy and Conservation Act.

Why traders should care

The SPR has been the market's pressure-release valve during the Iran war. As the barrels available for release shrink, the government's ability to cap crude prices weakens, leaving spot supply more exposed to the next disruption headline out of the Strait of Hormuz.

Watch the refill mechanics too. Any pivot to buying back barrels would be a structural bid under crude, while continued drains keep a lid on prices in the near term.

Options market and stocks to watch

USO: The US Oil Fund is the cleanest proxy for WTI. Watch for flow around Strait of Hormuz headlines and any signal on SPR refill timing.

XOM and CVX: Integrated majors benefit from sustained higher crude if the SPR buffer thins further. Watch call flow on any supply scare.

OXY: US-focused E&P with high oil-price torque. Watch for positioning tied to a potential government refill bid.

XLE: The broad energy sector ETF for a basket view on the trade. See more coverage on Unusual Whales.

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