Calistoga RD over Humbug Creek
Fair Condition91 years old5,800 vehicles/day
Location
| State | California |
| County | Sonoma |
| Location | 4.9 Mi N/o SR 12 |
| Carries | Calistoga RD |
| Crosses | Humbug Creek |
| Coordinates | 38.52459, -122.65414 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | Unknown |
Physical Characteristics
| Material | Concrete |
| Design | Slab |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 24.0 ft (7.3 m) |
| Deck Width | 27.6 ft (8.4 m) |
| Deck Area | 63.8 sq m |
| Main Spans | 1 |
| Year Built | 1935 (reconstructed 1962) |
Traffic
| Avg Daily Traffic | 5,800 (2015) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 20C0121 |