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Korbel Bridge

Photo taken by Walt Frazer in June 2008

Overview: Rainbow arch bridge over North Fork Mad River on Maple Creek Road
Location: Humboldt County, California
Status: Open to traffic
History: Built 1928
Builders: - F. E. Kelly (Engineer)
- F. J. Maurer & Son (Contractor)
- F. L. Grimm (Engineer)
Design: Concrete through arch
Dimensions: Length of largest span: 144.0 ft.
Total length: 429.2 ft.
Deck width: 18.7 ft.
Vertical clearance above deck: 13.5 ft.
Recognition: Eligible for the National Register of Historic Places
Also called: Maple Creek Road Bridge
North Fork of Mad River Bridge
Approximate latitude, longitude: +40.87028, -123.96132 (decimal degrees)
40°52'13" N, 123°57'41" W (degrees°minutes'seconds")
Approximate UTM coordinates: 10/418992/4524801 (zone/easting/northing)
USGS topographic map: Korbel
Inventory numbers: CA 4C-26 (California bridge number)
BH 10912 (Bridgehunter.com ID)
Inspection (as of 07/2010): Deck condition rating: Poor (4 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 50.7 (out of 100)
Average daily traffic (as of 2011): 624