Here are two more great images of the unbuilt Memorial Bridge, the bridge that was almost a tribute to Ulysses S. Grant. Read the previous post on that proposed bridge.
An early 1887 design for the memorial bridge across the Potomac River, by Paul J. Pelz.
A 1901 design for the memorial bridge by Edward P. Casey and William H. Burr, accepted by the Secretary of War but never constructed.
first proposed bridge design
Source: Robs Webstek