NB and SB Rte 280 over Lyell Street
San Francisco County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- NB and SB Rte 280 over Lyell Street in San Francisco County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1964 and reconstructed in 1972, making it 61 years old at the 2025 inventory.
- It carries about 170,000 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- It is one of 20 of the 144 inventoried bridges in San Francisco County rated poor (13.9%); 20 (13.9%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (37.73197, -122.43209)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous concrete multiple box beam |
| Length | about 179 ft |
| Location | 04-sf-280-r2.91-sf |
| NBI structure number | 34 0089 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in San Francisco County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 80 over Gate San Francisco Bay | 2013 | 265,000 | Good |
| St Rte 101 (5TH St over Bayshore Viaduct | 1955 | 256,700 | Fair |
| Interstate 80 over Yerba Buena Island | 1936 | 248,000 | Good |
| Interstate 80 over Yerba Buena Island | 2007 | 248,000 | Good |
| U.S. Highway 101 over 280/101 Ic - Alemany Cir | 1950 | 234,000 | Fair |
| U.S. Highway 101 over Cesar Chavez Blvd | 1951 | 234,000 | Poor |
All bridges nearby: San Francisco County, CA bridge conditions · every bridge in San Francisco County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.