 The Beechdale Bridge was added to the National Register of Historic Places in 1980.According to the United States Census Bureau, the township has a total area of , of which is land and (0.03%) is water.Brothersvalley Township is bordered by Stonycreek Township to the northeast, Allegheny Township to the east, Northampton & Larimer Townships to the southeast, Summit Township to the southwest, Black Township to the west, and Somerset Township to the northwest.