Rockport Granite Monoliths that once served as the structural supports for the 1880 - Howley Street Bridge in Peabody, MA. This remarkable grouping of Cape Ann granite columns are all 10'-12' in length. The columns are variable in diameter (average 12"-36"). Pricing is based on length and width (average $150-$300/LF). Call 781-334-4805 for more info.