Full Breakdown
Strategic Petroleum Reserve Near 40-Year Low, Experts Warn of Cavern Damage
8/16/2026, 3:03:40 AM
SPR Drawdown to Historic Low Amid Iran Conflict
The United States has released 172 million barrels of crude from the Strategic Petroleum Reserve (SPR) in response to supply disruptions caused by the war with Iran. Department of Energy data indicate the reserve has fallen below 300 million barrels for the first time since the early 1980s, leaving an estimated 243 million barrels on hand after the drawdown. The SPR’s 60 salt caverns, located at four Gulf-Coast sites in Texas and Louisiana, were originally designed to accommodate five full drawdowns over the system’s lifespan.
Technical Risks to Underground Salt Caverns
Petroleum-engineering professor Siddharth Misra of Texas A&M University explained that rapid, repeated drawdowns require pumping fresh water into cavern bases to push oil upward. This “wash-away” process thins the salt pillars separating adjacent caverns, creating flatter roofs and raising the likelihood of structural cave-ins. Misra noted that while 70 million barrels is the absolute minimum needed to keep intake pipes submerged in oil, the practical operational floor lies between 250 million and 300 million barrels; dropping below that range increases the risk of sludge reaching intake points and compromises pumping speed.
Official Government Position
Energy Department spokesman Ben Dietderich rejected the risk narrative, stating that “the caverns are always full. All that changes is the ratio of oil and water that is filling them.” The department also reiterated that at least 70 million barrels must remain to safely operate the caverns.
Expert Criticism and Market View
Amos Hochstein, senior energy advisor to President Joe Biden, called the 70-million-barrel figure “nonsense,” arguing that depleting the reserve below 300 million barrels would “damage the caverns” and could render the SPR unrecoverable. Republican lawmakers have previously raised similar concerns during the 2022 release of 180 million barrels after Russia’s invasion of Ukraine.
Verbatim Quotes
- “The caverns are always full. All that changes is the ratio of oil and water that is filling them,” — Ben Dietderich, Energy Department spokesman “The caverns are always full. All that changes is the ratio of oil and water that is filling them,” — Ben Dietderich, energy department spokesman
