Construction of the Walworth Run Sewer began in 1897. The above photo shows a section of the sewer under construction in 1898 at an undisclosed location in the Valley. The photo shows how construction of the sewer, and Walworth Avenue above the sewer, changed the topography of the land. The sewer which ranged in diameter from eight to more than 16 feet was constructed half-above ground. Atop the sewer was added three feet of dirt and then Walworth Avenue was built above that. Thus, at a minimum, the grade of the Valley floor where the river bed was once located was raised 7 feet, and at some places more than 11 feet.
