Historical Marker
Porter Flats
Historical marker location:
335 North Ewing Street, Helena, Montana
( Marker is on North Ewing Street near East 7th Avenue, on the right when traveling north.)
The town of Libby, Montana, was the site of one of the worst environmental disasters in US history, when it was discovered that vermiculite mined from the area was contaminated with asbestos. The contamination led to widespread illness and death, and cleanup efforts have been ongoing for several decades.