ST Helena Road over Mark West Creek
Fair Condition50 years old2,100 vehicles/day
Location
| State | California |
| County | Sonoma |
| Location | 1.1 Mi E Calistoga RD |
| Carries | ST Helena Road |
| Crosses | Mark West Creek |
| Coordinates | 38.51379, -122.63637 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 103.0 ft (31.4 m) |
| Max Span | 60.0 ft (18.3 m) |
| Deck Width | 26.2 ft (8 m) |
| Deck Area | 251.2 sq m |
| Main Spans | 1 |
| Year Built | 1976 |
Traffic
| Avg Daily Traffic | 2,100 (2015) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 48 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 20C0268 |