By The Schuylkill River & Urban Waters Research Corps Archive team
Change over time
Atlases of Delaware County dating back to 1848 show geographical and occupational changes in Tinicum Township over time. The township initially comprised of a series of islands, including Tinicum Island, Hog Island, and Little Tinicum Island. A series of efforts to fill in creeks and marshes, often corresponding to commercial and industrial developments, have since connected the islands of Tinicum Township, excepting Little Tinicum Island, to the Pennsylvania shore.