State Route 121 over Yellow Creek
Good Condition104 years old16,150 vehicles/day
Location
| State | California |
| County | Sonoma |
| Location | 04-son-121-6.52 |
| Carries | State Route 121 |
| Crosses | Yellow Creek |
| Coordinates | 38.23364, -122.46051 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Tee Beam |
| Total Length | 22.0 ft (6.7 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 28.5 ft (8.7 m) |
| Deck Area | 58.3 sq m |
| Main Spans | 1 |
| Year Built | 1922 |
Traffic
| Avg Daily Traffic | 16,150 (2014) |
| Truck Traffic | 8% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 20 0021 |