An Arkansas bridge was closed after heart-stopping video surfaced on social media showing it sag as a bus crossed it.

Arkansas Department of Transportation spokesman Danny Straessle said the bridge crossing the White River in Beaver would be closed until further notice after witnesses reported two large buses crossing it. It was reopened Thursday after undergoing structural inspections and deemed safe to cross.

Straessle says the buses had no identifying markings, but that both appeared to be tour buses that engineers estimate could have weighed up to 27 tons each.

Straessle says the weight limit is 10 tons for the one-lane bridge about 145 miles (233 kilometers) northwest of Little Rock.

The 75-year-old historic landmark (built in 1949) is known as the Golden Gate of the Ozarks.

Straessle says the bridge is designed to sag when vehicles cross it, but the concern is the driver took an overloaded bus onto the bridge.

Video of the incident was recorded by shocked drivers who could only stare in horror.

Other drivers honked to warn the driver of the risk, but there was no turning back. The structure was seen buckling slightly as the bus made its way across.

Fortunately, it reached the other side safely.

(AP)