 The Dauphin County Bridge No.27 was listed on the National Register of Historic Places in 1993.According to the United States Census Bureau, the township has a total area of 25.5 square miles (65.9 km²), of which, 21.9 square miles (56.8 km²) of it is land and 3.5 square miles (9.2 km²) of it (13.90%) is water.