The best clue to definitively identify this vessel is by examining her smokestack, which appears to have the typical "Quartered Diamond" (in Red & White) insignia of the "Shenango Steam Ship Company" (TSSC). This stack marking was only used for the earliest ships of this Fleet, I believe i.e. "William P. Snyder", "Wilpen" and possibly the "Shenango" for a short time. As the fleet grew, they transferred ownership of the vessels to a larger holding company under the parent firms name and changed their ships stack markings, accordingly. The later vessels of the same fleet carried a variation on their insignia, by just a single letter (TSFC) - which stood for the "Shenango Furnace Company". I have an actual contact print of this photograph in our archival collection (SMMC), which was taken by A.E Young & successors of Ste. Sainte Marie, Michigan and the ship shown locking upbound in the Poe Lock is unquestionably the steamer "William P. Snyder" (1906 GLEW Hull No.17), and I would date the photo (based on Youngs somewhat eccentric "coding" system as written on the negatives), as being taken sometime between 1914-16.