Bridge Type
Main Span(s): Masonry [8] Arch - Deck [11]
Approach Span(s): Other [00]
Deck: Not applicable [N] with Wearing Surface: Not applicable (applies only to structures with no deck) [N]
Bridge Dimensions
Length: 10.1 m = 33.1 ft
Main Spans: 1 at 8.8 m = 28.9 ft
Approach Spans: 0
Skew: 0
Width, Roadway: 8.2 m = 26.9 ft (2 Lanes) and Out-To-Out: 9.3 m = 30.5 ft for a 7.3 m = 24.0 ft approaching roadway.
Vertical Clearance: 99.99 m = 328.1 ft and Navigational Clearance: 0 = N/A
Location
Saint Helena [64140]: Napa County [055], California [06]
Owned by City or Municipal Highway Agency [04], DOT District: 4
0.3 MI WEST OF MADRONA ST
Condition
Deck: Not Applicable [N]
Superstructure: Fair [5]
Substructure: Fair [5]
Loading
Design:
Operating: 24.3 metric ton = 26.7 tons ()
Inventory: 16.2 metric ton = 17.8 tons ()
Appraisal
Structural: Meets minimum tolerable limits to be left in place as is [4]
Deck Geometry: Meets minimum tolerable limits to be left in place as is [4]
Road Alignment: Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Waterway: Better than present minimum criteria [7] and Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Inspections
Date: May 2020 [0520] and Frequency: 24
Future Work
Work Needed:
Bridge Detour: 4.2 km = 2.6 mi
Traffic
ADT: 1500 (2012) and Trucks: 10%
Future ADT: 4750 (In 2040
)
