Topics Infrastructure

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

Upper Roxborough filter beds

Upper Roxborough filter beds under construction, July 1902