NS/Philadelphia & Reading 1924, 51-arch Bridge in Harrisburg, PA

NS/Philadelphia & Reading: (Bridge Hunter, Historic Bridges, 3D Satellite, Street View)

I found the P&R bridge while looking for a satellite image of the Cumberland Valley Bridge.

Its 51 arches are three more than the Rockville Bridge. In the satellite image and in some of the photos I noticed pier ruins west of the bridge on the south side. I presume they are left over from a previous bridge.

HAER PA,22-HARBU,30--1 from LoC
OBLIQUE VIEW, LOOKING NE FROM WEST BANK OF SUSQUEHANNA RIVER. PIERS FROM SOUTH PENNSYLVANIA RAILROAD AT LEFT, PHILADELPHIA & READING RAILROAD BRIDGE AT RIGHT. - Philadelphia & Reading Railroad, Susquehanna River Bridge, Spanning Susquehanna River, North of I-83 Bridge, Harrisburg, Dauphin County, PA

HAER PA,22-HARBU,30--2 from LoC
OBLIQUE VIEW, LOOKING SOUTH FROM EAST BANK OF SUSQUEHANNA RIVER. NOTE INSCRIPTIONS ON PIER AT TOP LEFT. - Philadelphia & Reading Railroad, Susquehanna River Bridge, Spanning Susquehanna River, North of I-83 Bridge, Harrisburg, Dauphin County, PA