CHARLESTON, S.C. — An investigation has found a heavy rainstorm, not winds, led to the fall of a protective tarp that closed a major South Carolina bridge for more than 12 hours this summer.

The Department of Transportation issued its final report on the tarp falling on Charleston’s Don Holt Bridge on Interstate 526 in July.

Authorities say a dozen cars were trapped during rush hour and traffic around Charleston was crippled.

The DOT report says nearly 2 inches of rain fell in less than an hour and the water on the tarp caused its fasteners to fail. The report says winds gusted to 58 mph, but weren’t a factor.

The bridge is one of only two over the Cooper River connecting Charleston and North Charleston to Mount Pleasant.

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