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
It has three reinforced concrete spans with four continuous girders. Its spans are supported by reinforced concrete columns and abutments. The bridge has "massive and over-designed" slabs ( deep) and beams from wide, from deep. It is wide to accommodate trolley tracks in the middle.
The bridge was listed on the National Register of Historic Places in 1982.
See also List of bridges documented by the Historic American Engineering Record in Washington (state) List of bridges on the National Register of Historic Places in Washington (state) North 23rd Street Bridge, similar, nearby, narrower, longer, also designed by Waddell & Harrington, and also NRHP-listed
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