By 1715, all five planned bastions and two gates were complete. An additional, western, gate leading to the Upper Town was added in 1716. The construction of the outwork on the opposite bank of the River Drava, designed to offer protection from the north and to serve as a bridgehead, was completed by 1721. The final, fourth gate, leading to the Lower Town, was not added until 1783. Construction of the inner town was completed by 1733, and in 1735 three additional northern bastions were completed, along with a post office, the fort's construction office and a hospital. The completed fort had "eight bastions, two armories, two major depots, garrison headquarters, military court, construction office, garrison physician, guardhouse, officer apartments, military hospital and seven barracks". Based on the 'ring model', the fortifications took up an area of , making Tvrđa the largest fortress on the border with the Ottoman Empire.