St. Clair lies in a narrow valley rich with anthracite resources. The town was born around 1831, during the great hard coal boom in northeast Pennsylvania. Over the years the town expanded to surrounding areas or patches known as Arnouts Addition, Wadesville, Dark Water, New Castle, Mount Laffee, Crow Hollow, Ravensdale, Lorraine, Diener's Hill, East Mines, and Mill Creek. People came from these areas to work in the mines, railroads, and supporting industries. As the demand for coal increased, the town grew to a high point of 7,000 residents. The decline of the coal industry also brought the...