North 21st Street Bridge - Credit: Wikimedia Commons
North 21st Street Bridge - Credit: Wikimedia Commons
The North 21st Street Bridge in Tacoma, Washington was built in 1910. It was designed by engineers Waddell & Harrington and is a continuous concrete rigid-frame girder bridge. It is significant as one of the very earliest examples of its type. It was built "almost simultaneously" with the Asylum Avenue Aqueduct in Knoxville, Tennessee, which was documented by Carl W. Condit to be the first continuous concrete girder bridge to be built. with Read more on Wikipedia
Source: en.wikipedia.org