Hurricane Ida, one of the most powerful storms ever to threaten the U.S. coastline, brought dangerous storm surge and powerful winds to southern Louisiana on Sunday, testing a $14 billion system of levees around New Orleans on the 16th anniversary of Hurricane Katrina’s catastrophic landfall.

The forecast from the National Hurricane Center at 11 a.m. ET (10 a.m. CT local time) showed Ida boasting 150 mph sustained maximum winds — making it a higher-end Category 4 “major” hurricane — as it closed within 60 miles of the mouth of the Mississippi River, moving 13 mph. The storm made landfall near Port Fourchon at around 11:55 a.m. local time, the agency said in a follow-up tweet.

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