 The Squirrel Hill Site, an archaeological site and the location of a former Monongahela village, is located in St. Clair Township near the borough of New Florence.It is listed on the National Register of Historic Places along with the Laurel Hill Furnace.According to the United States Census Bureau, the township has a total area of 28.7 square miles (74.4 km²), of which, 28.4 square miles (73.5 km²) of it is land and 0.4 square miles (1.0 km²) of it (1.32%) is water.