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Old Duncan Grade Road Bridge

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Old Duncan Mills Grade

Looking north

Photo taken by Craig Philpott in September 2009

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Map 

Street View 

Facts 

Overview
Pratt through truss bridge over Austin Creek on Old Duncans Grd Road
Location
Sonoma County, California
Status
Intact but closed to all traffic
History
Built 1924
Design
Pratt through truss
Dimensions
Length of largest span: 117.1 ft.
Total length: 265.1 ft.
Deck width: 16.7 ft.
Also called
Austin Creek Bridge
Approximate latitude, longitude
+38.47083, -123.04694   (decimal degrees)
38°28'15" N, 123°02'49" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/495904/4258058 (zone/easting/northing)
Quadrangle map:
Duncans Mills
Elevation
51 ft. above sea level
Inventory number
BH 43378 (Bridgehunter.com ID)
Inspection (as of 10/2010)
Deck condition rating: Serious (3 out of 9)
Superstructure condition rating: Serious (3 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 27.0 (out of 100)
Average daily traffic (as of 1979)
30

Update Log 

  • June 11, 2012: Updated by Craig Philpott: updated status
  • May 15, 2010: New Street View added by Craig Philpott
  • February 19, 2010: Updated by Craig Philpott: Corrected design
  • September 13, 2009: Added by Craig Philpott

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