Neighborhoods Northwest Philadelphia

Thomas Mill Covered Bridge on the Wissahickon

Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)

Down Under III: A walk in the Dobson’s Run Storm Relief Sewer, June 15, 2010

Dobson FLP

Requiem for a stream: A brief history of Dobson’s Run

Black-and-white image showing a factory, smokestacks and smoke, and streets

Dobson’s Mill, 1884, from History of Philadelphia by Scharf & Wescott

Map of the County of Philadelphia from Actual Survey, 1843

Upper Roxborough filter beds

Upper Roxborough filter beds under construction, July 1902