The Central State Normal School, established to train teachers for central Pennsylvania, held its first classes in 1877 at a site overlooking the West Branch Susquehanna River. The small school, with enrollments below 150 until the 1940s, eventually became Lock Haven University of Pennsylvania. In the early 1880s, the New York and Pennsylvania Paper Mill in Castanea Township near Flemington began paper production on the site of a former sawmill; the paper mill remained a large employer until the end of the 20th century.