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Howell Mountain Bridge

Photos 

Howell Mountain Bridge

South face

Photo taken by Craig Philpott

BH Photo #219421

Map 

Description 

Stone arch bridge expanded in width by concrete arch and corrugated steel arch. Entire arch covered by earth fill placing current road bed 18 feet above historical bridge.

Facts 

Overview
Stone arch bridge over Conn Creek on Howell Mountain Road
Location
Angwin, Napa County, California
Status
Open to traffic
History
unknown history, three historical construction periods visible
Design
Stone arch
Dimensions
Length of largest span: 19.0 ft.
Deck width: 36.0 ft.
Also called
Conn Creek Bridge
Caioca Pass Bridge
Approximate latitude, longitude
+38.56247, -122.44221   (decimal degrees)
38°33'45" N, 122°26'32" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/548596/4268373 (zone/easting/northing)
Quadrangle map:
Saint Helena
Elevation
1667 ft. above sea level
Inventory number
BH 50038 (Bridgehunter.com ID)

Categories 

Angwin, California (1)
Arch (11,440)
California (2,258)
Deck arch (10,682)
Napa County, California (82)
Open (38,343)
Owned by county (19,729)
Span length under 25 feet (6,393)
Stone arch (2,752)

Update Log 

  • November 4, 2011: Added by Craig Philpott

Sources