Bridgehunter.com | Mad River Bridge

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Mad River Bridge

Detail, looking East

Photo taken by Craig Philpott in July 2010

Overview: Lost Warren through truss bridge over Mad River on US 101 in McKinleyville
Location: Humboldt County, California
History: Built 1929; rehabilitated 1959
Design: Subdivided Warren Through truss, riveted connections.
Dimensions: Length of largest span: 149.9 ft.
Total length: 740.2 ft.
Deck width: 24.6 ft.
Vertical clearance above deck: 14.8 ft.
Approximate latitude, longitude: +40.91667, -124.09278 (decimal degrees)
40°55'00" N, 124°05'34" W (degrees°minutes'seconds")
Approximate UTM coordinates: 10/407979/4530081 (zone/easting/northing)
USGS topographic map: Arcata North
Inventory numbers: CA 4-25R (California bridge number)
CA 04-25R (California bridge number)
BH 10911 (Bridgehunter.com ID)
Inspection (as of 09/2009): Deck condition rating: Poor (4 out of 9)
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 51.8 (out of 100)
Average daily traffic (as of 1997): 6,450