North 21st Street Bridge

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 950-foot (290 m) Asylum Avenue Aqueduct in Knoxville, Tennessee, which was documented by Carl W. Condit to be the first continuous concrete girder bridge to be built.[2]:1–2

North 21st Street Bridge
LocationSpans Buckley Gulch, N. Fife and Oakes, Tacoma, Washington
Coordinates47°16′3″N 122°28′11″W
Arealess than one acre
Built1910
Built byCreelman, Putnam & Healy
ArchitectWaddell & Harrington
Architectural styleRigid-frame girder bridge
MPSHistoric Bridges/Tunnels in Washington State TR
NRHP reference No.82004280[1]
Added to NRHPJuly 16, 1982

It has three 60 feet (18 m) 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 (9 feet deep) and beams (from 4 to 7 feet wide, from 9 to 11 feet deep. It is 48 feet (15 m) wide to accommodate trolley tracks in the middle.[2]

It was listed on the National Register of Historic Places in 1982.[1]

See also

References
  1. "National Register Information System". National Register of Historic Places. National Park Service. July 9, 2010.
  2. Lisa Soderberg (1979). "HAER/Washington State Bridge Inventory: North 21st Street Bridge". National Park Service. Retrieved 2016-06-10. with two photos


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