Portland Breakwater Fort

The Portland Breakwater Fort stands on the outer breakwater of Portland Harbour in Dorset. Built between 1868 and 1875, it was designed by Captain E. H. Steward of the Royal Engineers to defend the harbour and Royal Navy facilities. The fort has a circular shape with a 200-foot diameter granite base laid on the seabed. It was constructed to address subsidence issues and originally housed 14 heavy guns on its main floor. Below this were rooms for storing shells, cartridges, and engines, along with its own small harbour and barrack buildings. The fort’s armament changed over time, starting with seven 12.5-inch RML cannons in 1892. These were later replaced by smaller guns, including two 6-inch BL guns and two 12-pounder QF guns in 1907. During the First World War, it operated with two 6-inch BL Mk. VII guns, and in the Second World War, it served as an examination battery. By 1945, it was reduced to care and maintenance before being abandoned in 1956. Visitors can still see the remains of a dismantled 12-inch R.M.L. cannon protruding from the water. The fort remains derelict and is not open to the public. In 1995, the Dorset Sculpture Trust sought funding to convert it into an arts centre, but the project did not proceed. In 2005, BBC Spotlight’s Jonathan Hudston toured the site, estimating repair costs at £10 million. Portland Port Ltd, the current owner, has not prioritised its restoration. Opposite the fort, on the next stretch of the breakwater, stands the Portland Breakwater Lighthouse.