The US Strategic Petroleum Reserve has fallen to 316.5 million barrels as of July 10, 2026, its lowest level since April 1983. The reserve, which has a total storage capacity of 714 million barrels across four Gulf Coast sites, is now only about 44% full. At current consumption rates, the SPR covers roughly 16 days of total US oil usage or about 39 days of import coverage.
How the drawdown unfolded
The decline stems from the escalating US-Iran conflict that began in late February 2026. In March, the Department of Energy authorized the release of 172 million barrels to stabilize domestic supply and prevent price spikes. By July 10, approximately 98.9 million barrels had actually been withdrawn, representing about 57% of the authorized amount.
One year ago, the SPR held around 403 million barrels. The roughly 87-million-barrel year-over-year decline is almost entirely due to Iran-related drawdowns. Combined US oil inventories, including both commercial stocks and the SPR, stood at just 730.8 million barrels in early July, the lowest combined figure since 1984.
Replenishment promises and market implications
The Trump administration has described America's energy security as "as strong as ever" and outlined a plan to replace the drawn oil plus an additional 20%. Officials intend to purchase approximately 200 million barrels over the next year, promising the refill would come at no cost to taxpayers.
However, similar promises have been made before. After the Biden administration sold off a historic amount of SPR oil in 2022 to combat high gasoline prices, refilling proved slower and more complicated than initially suggested. Barrels eventually started flowing back in, but the pace never matched political rhetoric.
For energy markets, a depleted SPR means less ammunition to fight the next supply shock. If the Iran situation escalates further or any other disruption hits global oil flows, the buffer that normally absorbs those blows is significantly thinner. Investors should watch weekly SPR data closely: if withdrawals accelerate beyond the 98.9 million barrels already pulled, or if replenishment timelines slip, the energy market's volatility premium will likely increase.