State Route 121 over Sonoma Creek
Fair Condition55 years old19,000 vehicles/day
Location
| State | California |
| County | Sonoma |
| Location | 04-son-121-r7.30 |
| Carries | State Route 121 |
| Crosses | Sonoma Creek |
| Coordinates | 38.24037, -122.45142 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 8 (Very Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 231.0 ft (70.4 m) |
| Max Span | 100.1 ft (30.5 m) |
| Deck Width | 46.9 ft (14.3 m) |
| Deck Area | 1006.7 sq m |
| Main Spans | 3 |
| Year Built | 1971 |
Traffic
| Avg Daily Traffic | 19,000 (2014) |
| Truck Traffic | 7% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 48 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 20 0022 |