the bridge was of opus quadratum, of which the imposing central arch stands out, 32 m high and 10 m span. Spurs are visible on the various pylons, which were used to hook and support the scaffolding both during the construction of the bridge, but above all during the numerous restorations. In the post-Severan period it was reinforced by covering it almost completely with brick-clad opus caementicium and adding small arches at the bottom of the bridge. On the east side of the bridge, on the south pillar near the stream, is a part of a supporting arch never completed, a sign that the bridge underwent several design changes during its construction. On the west side of the bridge, the channel turns at right angles and can be followed for several tens of metres. Ponte Barucelli The Ponte Barucelli (also known as Ponte Diruto) is made up of two monumental bridges 8 m apart for the Anio Novus (to the south) and the aqua Claudia (to the north) to cross the Acqua Nera stream. Both date to between 38 and 52 AD. They were later strengthened with buttresses and reinforcements, becoming two huge continuous and connected structures. The Anio Novus bridge, about 85 m long and about 10 m wide, has a few small arches except for the main high and narrow one for the Acqua Nera. It had originally been built of tuff in opus quadratum. In the second half of the 1st century it was reinforced in opus mixtum, visible at the two east end buttresses. At the beginning of the 3rd century nine rectangular buttresses were added at regular intervals on the north side while on the south side only three were added near the bed of the stream, later increased by five on the west bank in poor opus latericium and two on the east in opus mixtum. Later the two bridges were connected by three brick arches and with buttresses. See also List of aqueducts in the city of Rome List of aqueducts in the Roman Empire List of Roman aqueducts by date Parco degli Acquedotti Ancient Roman technology Roman engineering References External links Subiaco Roman dams Map of Rome with Anio Novus running (red) Travertine reveals ancient Roman aqueduct supply Buildings and structures completed in the 1st century Ancient Roman aqueducts in Rome 50s establishments in the Roman Empire 1st-century establishments in Italy Claudius