Hormuz Day 45: The Dual Blockade Closes the Gulf From Both Ends
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Route Status
The Islamabad talks broke up after ~21 hours with no agreement. Within hours Washington answered with a naval blockade of Iranian ports, effective 10am ET, run by CENTCOM under Adm. Brad Cooper. CENTCOM was explicit that the cordon applies only to vessels sailing to or from Iranian ports, not to third-country traffic in the wider Gulf. That distinction matters for charterers, but it does not change the operational reality on the water.
For 45 days the constraint was one-directional. Iran shut Hormuz to “hostile” shipping and ran a selective toll corridor, choking inbound and through traffic. Now there is a second cordon facing the other way. The US Navy is sitting on Iran’s own export terminals. Kharg Island, which moves ~90% of Iranian crude, has buyers it cannot legally reach and a sea lane it cannot legally use. Bandar Abbas, Bandar Khomeini and the Asaluyeh gas complex sit behind the same wall.
This is the dual blockade. The Gulf is sealed from both ends, and every laden Iranian barrel inside it is now stranded tonnage.
Fleet Impact
First 24 hours, per CENTCOM: no vessel attempted to run the line, and six commercial ships complied with redirect orders and turned back to Iranian ports. That compliance rate tells you owners are not testing a US carrier group for a single cargo. War-risk underwriters will not write a voyage into a declared blockade zone, and without cover the charter does not happen.
The squeeze lands hardest on the shadow fleet that has carried discounted Iranian crude to Asian buyers. Those vessels are now boxed in: they cannot load and clear, and the Hormuz exit remains closed to most flags. Expect laden tankers to accumulate at anchor off Kharg and Bandar Abbas with nowhere to discharge and no insured route out.
Gulf-wide, the through-traffic that was already minimal stays minimal. Pre-crisis Hormuz moved ~20M bbl/day across ~138 transits. Open transits have been near zero for weeks.
Cost Picture
| Metric | Pre-crisis | April 13 |
|---|---|---|
| Brent | ~$70-75/bbl | ~$99.36/bbl (+~4%) |
| WTI | ~$66-70/bbl | ~$99.08/bbl (+~2%) |
| Hormuz transits/day | ~138 | near zero |
| VLCC war-risk premium | nominal | prohibitive / uninsurable into blockade zone |
Crude snapped higher on the headline. The two-week ceasefire that began April 7-8 had pulled WTI down hard off its ~$113-115 peak; the failed talks plus a fresh blockade reversed that, with Brent and WTI both settling back near $99. The move is a risk-premium repricing, not a supply event yet. The barrels Washington is now blocking were largely already removed from the legal market by sanctions. What changed is the path back: a negotiated reopening just got further away, and the market is pricing a longer closure.
Alternatives
For Iranian crude there is no maritime alternative while the cordon holds. Pipeline egress is marginal; the Goreh-Jask line was built to bypass Hormuz, not a US Navy blockade, and its throughput is a fraction of Kharg’s. For everyone else, the established workarounds carry on: Saudi East-West to Yanbu, the UAE Fujairah line to the Gulf of Oman, both feeding Red Sea and Indian Ocean loadings that still face Bab el-Mandeb risk on the far side.
Bottom Line
If you own or charter tonnage with any Iranian nexus, that trade is closed for the duration. Do not expect cover. For Gulf trades generally, CENTCOM’s carve-out keeps the legal door open, but war-risk pricing and the closed strait keep volumes on the floor. The diplomatic offramp that markets were leaning on through the truce just shut. Plan for a sealed Gulf, not a reopening.