What survives of the original bridge into Valletta are three rock cut supports within the Grand Ditch which were hewn to support the arched bridgeway into Valletta through Porta San Giorgio/Reale. It seems that the original bridge was narrower than the present one. The rock supports were widened by additional masonry work to accommodate a wider bridge and for heavier vehicular traffic.
The rock supports were formed into rough foundations as pilasters to support masonry semicircular arches that formed the bridge. The rock-cut supports were repeatedly re-utilised every time that the gate and the bridge were modified.
Mepa scheduled the Remains of the Bridge of Prota Reale / Porta San Giorgio as a Class B national monument as per Government Notice No. 276/08 in the Government Gazette dated March 28, 2008.