Structure 34 0046 · San Francisco County, CA
Carries Interstate 280 over Caltrain Up Rr City Sts, 04-sf-280-r4.40l-sf.
21,588 ft end to end, longest span 132 ft: about 60 football fields, or 4.1 miles. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a box-beam bridge.
| State | California |
| County | San Francisco |
| Location | 04-sf-280-r4.40l-sf |
| Carries | Interstate 280 |
| Crosses | Caltrain Up Rr City Sts |
| Coordinates | 37.73559, -122.40574 |
| Material | Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 21587.9 ft (6,580 m) |
| Max Span | 131.9 ft (40.2 m) |
| Deck Width | 109.3 ft (33.3 m) |
| Deck Area | 219,114 sq m |
| Main Spans | 234 |
| Year Built | 1965 |
| Avg Daily Traffic | 107,000 (2019) |
| Truck Traffic | 2% |
| Lanes On Bridge | 6 |
| Lanes Under Bridge | 40 |
| Last Inspection | February 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Not applicable |
| Structure Number | 34 0046 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.