Mariposa ST over Caltrain & Up Rr
Poor Condition58 years old20,000 vehicles/day
Location
| State | California |
| County | San Francisco |
| Location | At SR 280 |
| Carries | Mariposa ST |
| Crosses | Caltrain & Up Rr |
| Coordinates | 37.76401, -122.39328 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 100.1 ft (30.5 m) |
| Max Span | 50.5 ft (15.4 m) |
| Deck Width | 70.9 ft (21.6 m) |
| Deck Area | 658.8 sq m |
| Main Spans | 2 |
| Year Built | 1968 |
Traffic
| Avg Daily Traffic | 20,000 (2017) |
| Truck Traffic | 10% |
| Lanes On Bridge | 5 |
Inspection & Ownership
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 34C0005 |