2 votes

Bohemian Highway Bridge (1934)


Bohemian Hwy

Looking S

Photo taken by Craig Philpott in September 2009


BH Photo #146673

Street Views 


Pratt Pony truss bridge over Russian River on Bohemian Highway in Monte Rio
Sonoma County, California
Open to traffic
Future prospects
Slated for demolition and replacement.
Built 1934
Steel Pratt Pony truss with extensive concrete elements
Length of largest span: 100.1 ft.
Total length: 772.0 ft.
Deck width: 20.0 ft.
Also called
Monte Rio Bridge (1934)
Monte Rio Bridge (1934)
Approximate latitude, longitude
+38.46608, -123.00992   (decimal degrees)
38°27'58" N, 123°00'36" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/499134/4257529 (zone/easting/northing)
Quadrangle map:
Duncans Mills
32 ft. above sea level
Average daily traffic (as of 2011)
Inventory numbers
CA 20C-18 (California bridge number)
BH 11603 (Bridgehunter.com ID)
Inspection report (as of November 2018)
Overall condition: Fair
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 54.8 (out of 100)
View more at BridgeReports.com


Beam (17,373)
Built 1934 (844)
Built during 1930s (12,327)
California (2,804)
Concrete stringer (888)
Doomed (1,100)
Have street view (30,429)
Open (41,449)
Owned by county (22,000)
Pony truss (17,553)
Pratt pony truss (4,132)
Pratt truss (10,846)
Riveted (2,776)
Russian River (28)
Sonoma County, California (106)
Span length 100-125 feet (4,682)
Total length 500-1000 feet (3,200)
Truss (38,318)

Update Log 

  • January 11, 2022: New photo from Geoff Hubbs
  • June 12, 2019: Updated by Nathan Holth: This bridge is now doomed.
  • April 11, 2018: New Street View added by Luke
  • June 11, 2016: Updated by Christopher Finigan: Added category "Riveted"
  • December 6, 2010: New photos from Kevin Pope
  • April 17, 2010: New Street View added by James Baughn
  • February 19, 2010: Updated by Craig Philpott: Corrected design
  • September 26, 2009: Updated by Craig Philpott: added name and elevation

Related Bridges 


  • Craig Philpott - craigphilpott63 [at] gmail [dot] com
  • Kevin Pope
  • Luke
  • Nathan Holth
  • Monte Rio Bridge Replacement - We are currently replacing the one-lane bridge over the South Fork of the Gualala River with a two lane, 29 foot wide and 165 foot long steel bridge. The new bridge is being constructed adjacent to the existing bridge, and will provide two lanes desi
  • Geoff Hubbs


Bohemian Highway Bridge
Posted June 12, 2019, by Erik Hoffman (norcalroadswebsite [at] gmail [dot] com)

Okay, I see now. Sorry, I scrolled through too fast and thought the pictures of the approaches were main spans.

Bohemian Highway Bridge
Posted May 17, 2019, by Nathan Holth (webmaster [at] historicbridges [dot] org)

I've visited this bridge, it functions as a truss. Photo #16 shows the transverse floorbeams which indicate that the trusses are indeed functioning to handle live loads. The longitudinal deck stringers bear on the floorbeams.

Bohemian Highway Bridge
Posted May 17, 2019, by Erik Hoffman (norcalroadswebsite [at] gmail [dot] com)

Are the trusses on this even load-bearing? The "floorbeam" system on this looks more like load-bearing stringers to me.