Time Periods 1900-1910

Schuylkill River watershed, population in 1904

Aqueduct carrying sewer over Creishem Creek, in the Wissahickon Valley, 1892

Cresheim Aqueduct

Philadelphia the Manufacturing and Industrial Capital map, 1906

Fairmount, bird's eye view from Lemon Hill (detail)

Fairmount Park, bird’s eye view from Lemon Hill, detail

Two bottles of water from a river, one dark with pollution and one clear after filtration

Water Before and After Roxborough

Eleven men in a work gang plug leaks in a tunnel, the Torresdale Conduit

Torresdale Conduit work gang, 1906