Great Crossings

Historical marker location:

Markleysburg, Pennsylvania

( Marker is on National Pike (U.S. 40) 1.2 miles east of Dark Hollow Road (Local Route T876), on the right when traveling east.)

Marker installed: 1947

Pennsylvania was the site of the deadliest nuclear accident in U.S. history. In 1979, a partial meltdown occurred at the Three Mile Island nuclear power plant in Harrisburg, Pennsylvania.