Frankford Avenue (Philadelphia side) meets Bristol Pike Andalusia, Buck county side) at this bridge. Both are US 13.
Its HAER page is here, with photos, a drawing, and other details:
This was listed on the NRHP in 1988:
http://en.wikipedia.org/wiki/Poquessing_Creek
(I started this wikiarticle and the one on the much older Frankford Creek Bridge over Pennypack Creek.)