Flatbrookville was once a self-sustained hamlet with stores, mills, dwellings, two hotels, a church, and a school. Walpack Township's first post office was established here in 1828. Nearby were early 1700s sites of frontiersman Benjamin Barton's mill, a Moravian missionary school, a Dutch Reformed Church, and Fort Walpack, built for the French and Indian War and later used for the Revolutionary War. The Lower Walpack Cemetery was established circa 1737. The name Walpack came from the Lenape word for the whirlpool formed at the Delaware River's bend. Decker's Ferry transported Revolutionary War soldiers, then was moved one mile northwest and renamed Rosenkrans Ferry. Smith's Ferry also operated nearby. In the late 1960s, inhabitants were removed and remaining structures were destroyed for the Tocks Island Dam Project.