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Mill Road Bridge

(Chester County Bridge #167)

  • Year Built: 1882

  • Type: Pratt Pony Truss

  • Number of Spans: 1

  • Length: 37’

  • Width: 14’

  • Builder: Denithorne Brothers of Phoenixville, Pennsylvania

  • Location: Tredyffrin Township, Chester County

  • Carries: Mill Road over Valley Creek

  • Preservation Assistance: Unknown

  • BRKey: 10720

The Mill Road bridge is a pin connected Pratt pony truss built in 1882 by Denithorne Brothers of Phoenixville. This single span bridge is 37’ long and 14’ wide.  It is located in Tredyffrin Township in Chester County where it carries Mill Road over Valley Creek.

The character defining features of this bridge include the truss material (wrought and cast iron), truss form (Pratt pony), method of truss member end connections (pinned with cast iron connecting pieces used at the inclined end post upper connections), structural members to include the top and bottom chords, vertical and diagonal members, fishbelly floorbeams, U-bolt floorbeam hangers and builders plaque. An unusual feature of the bridge is the threaded rod with nut connection detail where the diagonal member meets the top chord and end post.

To preserve this historic structure, ownership of the bridge in its entirety will be transferred to an interested party for removal to a new location. The new owner will be responsible for costs associated with lifting, dismantling, transporting, rehabilitating, re-erecting, as well as long-term maintenance of the structure. If you or your organization is interested in assuming ownership of this historic bridge, please contact Tyra Guyton at or at 717-346-0617 or Monica Harrower of PennDOT District 6 at or at 610-205-6709.