![[Concrete Bridge on Line of Walnut Lane Over the Wissahickon Creek, Philadelphia]](/images/concrete_bridge_on_line_of_walnut_lane_asce_428_small.png "Concrete Bridge on Line of Walnut Lane Over the Wissahickon Creek, Philadelphia")
Description: Diagrams of the Walnut Lane Bridge from three different viewpoints: from above, from the creek, and from a point parallel to the bridge.
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 428).