1907 William Howard Taft/Connecticut Avenue Bridge over

(Bridge Hunter; no Historic Bridges; HAER; 3D Satellite)

3D Satellite

Photo via LoC, cropped
Credit line: West Virginia Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.
Carol M. Highsmith's photographs are in the public domain.

 

Photo via LoC
Credit line: West Virginia Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.
Carol M. Highsmith's photographs are in the public domain.

Bridges Now and Then posted
A c. 1908 postcard of Washington, DC's, Connecticut Avenue Bridge, renamed the William Howard Taft Bridge in 1931 (Detroit Publishing)
Also StreetsOfWasyington

 

StreetsOfWashington
"It was one of the first and largest unreinforced concrete bridges in the world....The bridge rises 136 feet from the floor of Rock Creek Park and extends 1,341 feet across the valley. "
[Since unreinforced concrete is weak with respect to tension forces, an arch bridge is necessary because it has just compressive forces.
This web site has several more images of the bridge.]
BridgeHunter has a higher resolution copy

Street View