Watersheds Delaware River Watershed

Map Lovers’ Monday: Philadelphia Topography

Map Lovers’ Monday: Philadelphia in 1957, according to the Pennsy

Map Lovers’ Monday: Topography of Philadelphia from 1863

Map showing various routes of transportation in Philadelphia and surrounding area. Focused mainly on suburban Philadelphia areas.

Map Lovers’ Monday: 1896 Suburban Transportation Map

Kensington Water Supply in 1883

Black-and-white image of a creek with people around it and a large building behind it

Dock Creek Sewer in 1849: A report on its condition made to City Councils

High Water: Flooding in Philadelphia

From Creek To Sewer

The Water Supply Problem of Philadelphia, 1899

Black-and-white photograph depicts a large brick sewer tube lying on a barren landscape

Streams, islands, and ferries of early Philadelphia

Dauphin and Sydenham car crash, Jan. 17, 1978

Black-and-white line graph showing two jagged lines on a grid

Diagram Showing Decreased Amount of Dissolved Oxygen in Delaware River, 1913