![[Location Plan: Bridge on Line of Walnut Lane Over Wissahickon Creek, Philadelphia]](/images/walnut_lane_bridge_location_plan_asce_425_small.png "Location Plan: Bridge on Line of Walnut Lane Over Wissahickon Creek, Philadelphia")
Description: Topographical map (circa 1909) of the bridge and its surroundings, as well as a profile view of the grade.
Source: George S. Webster and Henry H. Quimby, "Walnut Lane Bridge, Philadelphia" (Transactions of the American Society of Civil Engineers, December 1909, vol. LXV, page 425).