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Purdy Bridge


View South From East Bank Looking South

Photo taken by Historic American Engineering Record

View photos at Library of Congress

BH Photo #195999


Purdy Bridge was one of the first reinforced-concrete box girders in the nation when completed and the longest.


Concrete deck girder bridge over Burley Lagoon on Washington 302
Pierce County, Washington
Open to traffic
Built 1936, Rehabilitated 1966
- Homer Hadley of Seattle, Washington (Conceptual Designer)
- Portland Dredging Co. of Portland, Oregon (Contractor)
- W.H. Witt Co. of Seattle, Washington (Consulting Design Firm)
The Purdy Bridge is a 550-foot long, continuous box girder bridge. It is one of a handful designed and built in Pierce and King Counties during the 1930's. Workmen poured concrete around a hollowed, steel box girder to form the roadway slab and top flanges, 15-feet wide and 7-inches deep at the crown. The long, 190-foot middle section was designed as a simple suspended beam. The piers were also cellular and flush with the sides of the deck box girder.
(Spanning Washington, Historic Highway Bridge of the Evergreen State, Craig Holstine & Richard Hobbs, 2005)
Length of largest span: 190.0 ft.
Total length: 550.0 ft.
Deck width: 20.0 ft.
Posted to the National Register of Historic Places on July 16, 1982
Approximate latitude, longitude
+47.38382, -122.62851   (decimal degrees)
47°23'02" N, 122°37'43" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/528039/5247884 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2016)
Inventory numbers
NRHP 82004274 (National Register of Historic Places reference number)
BH 44372 (Bridgehunter.com ID)
Inspection report (as of June 2018)
Overall condition: Poor
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Poor (4 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 29.6 (out of 100)
View more at BridgeReports.com

Update Log 

  • January 28, 2015: Updated by Nathan Holth: Corrected H.W. Witt Co. to W.H. Witt Co.
  • October 2, 2014: Updated by Nathan Holth: Merged NBI Data, listed as continuous, listed rehab date.
  • March 24, 2011: New photos from Michael Goff