Projects to dredge the Delaware River began in 1885. The latest project aimed to deepen the river to 45 feet. There are still dredging barges on the Delaware to maintain the depth. Various locations in Tinicum, such as Little Tinicum Island and Hog Island, have historically served as locations to deposit dredged materials.
“Dredging Projects ,” Schuylkill River & Urban Waters Research Corps Archive, accessed September 24, 2018, http://schuylkillcorps.org/items/show/138.