What Destroyed this Majestic Bridge?

Once upon a time, a majestic bridge spanned a remote gorge in McKean County, Pennsylvania, transporting natural resources to a rail line in New York to take to Buffalo. This daring marvel of engineering bridge the literal between Pennsylvania Wilds and civilization. Then, in 2001, some mysterious force took this bridge down. What was it?

From Kinzua Bridge State Park August 2024.