Wilson Tschiffely's grain mill was located on the south side of River Road and remained in operation until from 1902 to 1931. It stood abandoned until improvements to River Road were made in 1959, when the mill was demolished. This area was established as Seneca Mills in 1732 and there had been a mill operating at this site ever since. Poole's General Store (formerly Allnutt's Store) can be seen in the background of both photographs.

If you travel further down Tschiffely Mill Road towards the C&O Canal, you will find the ruins of the Seneca Stone-Cutting Mill. Rough stone was quarried and cut here before being shipped down the canal for use in buildings like the Smithsonian Castle.