Map Lovers’ Monday: Topography of Philadelphia from 1863
Dock Creek Sewer in 1849: A report on its condition made to City Councils
From Creek To Sewer
Streams, islands, and ferries of early Philadelphia
Filling valleys and other lowlands, cutting down high ground, piping streams into sewers, filling marshland, dredging and damming streams and rivers, and any other activities or infrastructure designed to alter the original topography of the city to more readily accommodate real estate development.