Parker, John Henry: The archaeology of Rome (1,text): I. The primitive fortifications (Oxford [u.a.], 1874)

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Appendix to Historical Construction of Walls.

arcade, also with columns in front of the piers, and the colonnade
of another temple facing this, as if on the other side of the street;
and running across this, on the opposite side of the square temple
from the round one, is a double line, which may very well indicate
a bridge crossing the street. It seems probable that these two
temples are the square temple of Augustus, and the round temple
of Minerva, on the site of the latter of which the round church
of S. Theodore has been built. In that case, the bridge from the
Palatine to the Capitol nearly touches the temple of Augustus, and
being at a very high level, carried on a triple arcade one over the
other, may very well have been called over it.
There are lofty bridges of this kind to carry the aqueducts across
the gorges on the mountains, in several places between Subiaco and
Rome, especially one which remains nearly perfect, about five miles
from Tivoli, on the side next to Rome, on the road to Poli, called
Ponte Lupo. The top of the bridge, with the specus of the aque-
duct upon it, must be nearly a hundred feet above the level of the
mountain-stream that passes under it. This specus is carried on
a triple arcade, and level with the bottom of the upper arcade is
a road for horses carried on a vaulted substructure, by the side of
the two lower tiers of arches, and built up against them, so that
they form one side of the vaults. There is a similar bridge now in
use both for an aqueduct and for horses at Spoleto, between Rome
and Florence, and there are remains of similar bridges in many
places. It was always usual and necessary to have a road by the
side of an aqueduct for the use of the aquarii, or the men charged
with keeping it in repair. The plan of the bridges from the Palatine
to the Coelian at one end, and to the Capitol at the other, seem to
have been exactly the same. On the side next the Ccelian we have
some arches of the lower arcade remaining, and here we have no
traces of the lower bridge for horses ; but on the side of the Palatine
opposite to the Capitol we have two of the tall brick piers, with the
springings of the arches of the upper arcade, and remains of the
bridge for horses by the side of it, as we have mentioned.