Engineers are trying to determine how to remove a semi truck that crossed over one Milwaukee pedestrian bridge and became disabled at a second bridge in Lake Park.

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The Milwaukee County Sheriff's Office released new information on the semi that plowed through a popular park.The driver squeezed the truck through two historic pedestrian bridges and caused damage along the way.The driver, 50, from New Whiteland, Indiana, said he was following his GPS which said the Oak Leaf Trail was a road.VIDEO: Ground, aerial shots of truck stuck in Lake ParkIt's an extremely tight space behind the North Point Lighthouse. The truck traveled across one bridge, took out a tree and hit the concrete on the South Lion Bridge before coming to a stop.North Point Lighthouse Museum Curator Mark Kuehn said a railing was broken and cement was scratched.Click here for more photosAccording to the Milwaukee County Sheriff's Office, the truck driver's GPS said it was a road. Historian John Gurda said it was a road -- a half-century ago.“This was actually a carriageway. You would have seen some fine horses and carriages going back and forth, but not semi-trailers. It was not built for that,” Gurda said.“They closed the bridges in 1964 because the bridge trusses were so frail,” Kuehn said.Experts are surprised the North Bridge didn't give way. The truck was empty as it passed over.“If he had been carrying bricks, he would have been in that ravine. The bridge would have certainly collapsed,” Gurda said.The driver received two citations -- failure to obey signs and reckless driving.WISN 12 News contacted the trucking company, Paschall Truck Lines Inc., which said it had no comment. It took two tow trucks about four hours to remove the truck Wednesday while people watched."We've seen a lot of wildlife and that, but we've never seen a semi-trailer. This is a first," Dennis Anderson said."It's unbelievable, unbelievable," Robert Fuchs said.Lake Park and the North and South Lion bridges have a long history and the area is on the National Register of Historic Places.The park was designed in 1893 by Frederick Law Olmsted. He was the celebrated landscape architect who created New York City's Central Park and the U.S. Capitol grounds in Washington, D.C.Olmstead considered Milwaukee’s North Point Lighthouse the "crown jewel" of the city.The Milwaukee County Sheriff's Office said in a release, both bridges were inspected by a county structural engineer.VIDEO: Historic bridge damaged by wayward semiThe engineer reportedly said they were safe for people to walk on once the truck is removed.