BEAVER CO. (KDKA) — Pennsylvania leads the nation in the number of bridges classified as “structurally deficient.”

More than 500 bridges in the state are about to be replaced, including more than a dozen in Beaver County over the next year and a half.

One of them is Tramp Mill Run. This all part of PennDOT’s Rapid Bridge Replacement Program.

“They are all considered structurally deficient, which does not mean they are unsafe to use, but they don’t meet current standards. They have outlived their useful life span,” said David Galvin, spokesperson for the bridge replacement program.

The near $900 million project aims to replace 560 bridges in 66 of the 67 counties across the state.

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This is a public-private partnership between PennDOT and the private contractor Plenary-Walsh.

One of the other bridges in Beaver County to be replaced is Bocktown Cork Road which crosses Raredon Run Creek.

“This is a complete removal and replace, everything will be brand new with a 100-year life span and they also come with a 25-year warranty,” Galvin said.

Many of the structures to be replaced aren’t the largest bridges in the state nor the most traveled.

“The busiest bridge that we are going to replace on the project has 28,000 vehicles a day while the quiter one has about thirty,”

From start to finish most of the projects will take 10 weeks.