17th Century

Frankford Avenue Bridge (Philadelphia County, Pennsylvania)
Built 1697 by the residents of Lower Dublin Township; widened 1893
Three-span stone arch bridge over Pennypack Creek on Frankford Avenue (US 13) in Holmesburg
Under construction

Somerset Drawbridge (Colleton County, South Carolina)
Much Modified Still in use
Bridge over Scaur Bay on Middle Road
Open to traffic