A very large stone / stucco mill of 3.5 stories plus a basement. The 50'X 65' structure has a catshead dormer on the street side. In 1837, a localized tornado / waterspout took the mill buildings roofs off, twisted tops off nearby trees, and sucked water out of the dammed water impoundment, dropping fish onto neighboring fields towards Camp Hill.

An earlier mill was built about 1710 by Edward Farmar. His mill enjoyed a good reputation by 1713 and was passed on to his son-in-law, Peter Robeson when he died in 1745. Peter passed the mill to his son Jonathan. In 1780, Jonathan Robeson was assessed at 238 acres, a grist mill, 3 negroes, one riding chair (carriage?), 5 horses and 4 cattle. He also had acquired a family that contained 11 children.

The mill next came into the possession of Samuel Morris; then his brother, Joshua Morris, and to his son-in-law, Isaac Mather. Mather's son built the present mill in 1820. Next owner was William Miller for a short time, then Samuel W. Comley for a number of years, William H. Witte, and Charles Otterson Esq. in 1884. Silas Cleaver took over the enterprise in 1884.

Under Silas and John Cleaver's direction, C & J Cleaver & Sons, the mill was greatly improved, new machinery installed, modern appliances introduced, and the production capacity was greatly improved. The mill continued to operate into the late 1800's. After sitting idle for many years, the mill was obtained by the State of Pennsylvania around 1965. Much restoration was accomplished and the mill is a State Historical Treasure along with its companion mill house, Hope Lodge, built by Samuel Morris in 1743.