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Van Duzen River Bridge (1925)


Oblique View Of Downstream Elevation, Looking Northeast

Photo taken by Historic American Engineering Record

View photos at Library of Congress

BH Photo #137048

Street View 


Significance: The Van Duzen River Bridge, also known as the Alton Bridge, was determined eligible for listing in the National Register of Historic Places in 1986. It represents a transitional design in the evolution of concrete arch bridges, and is the earliest surviving bridge designed under the direction of Harlan D. Miller, California's second state bridge engineer and the man most responsible for providing engineering design and aesthetic direction for California bridges between 1924 and 1940. (From HAER)


Lost Open-spandrel arch bridge over Van Duzen River on U.S. 101
Humboldt County, California
Replaced by new bridge in 1996
Built 1925, Replaced 1996
- Bordwell & Zimmerman of Calistoga, California (Contractor)
- Golden Gate Portland Cement Co. of Cement, California
- Harlan D. Miller of Oakland, California (Bridge Engineer)
Open-spandrel arch
Length of largest span: 163.1 ft.
Total length: 788.1 ft.
Deck width: 21.0 ft.
Eligible for the National Register of Historic Places
Also called
Alton Bridge
Approximate latitude, longitude
+40.53667, -124.14667   (decimal degrees)
40°32'12" N, 124°08'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/402890/4487956 (zone/easting/northing)
Quadrangle map:
Average daily traffic (as of 2010)
Inventory numbers
CA 04-17R (California bridge number)
BH 42334 (Bridgehunter.com ID)
Inspection report (as of July 2017)
Overall condition: Good
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 97.4 (out of 100)
View more at BridgeReports.com

Update Log 

  • September 6, 2021: New photo from Geoff Hubbs
  • March 22, 2011: New photo from Michael Goff
  • April 29, 2010: New Street View added by Craig Philpott
  • April 13, 2009: Added by Michael Goff

Related Bridges 


  • Mike Goff - michael [dot] goff [at] hotmail [dot] com
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  • Craig Philpott - craigphilpott63 [at] gmail [dot] com
  • HAER CA-269 - Redwood National & State Parks Roads, California coast from Crescent City to Trinidad, Crescent City vicinity, Del Norte, CA
  • Geoff Hubbs