St Rte 101 (5TH St over Bayshore Viaduct
San Francisco County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- St Rte 101 (5TH St over Bayshore Viaduct in San Francisco County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1955, making it 70 years old at the 2025 inventory.
- It carries about 256,700 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- It is one of 76 of the 144 inventoried bridges in San Francisco County rated fair (52.8%); 20 (13.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2023, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (37.76431, -122.40482)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 7,501 ft |
| Location | 04-sf-101-4.12-sf |
| NBI structure number | 34 0088 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
| Fracture critical (item 92A) | Yes |
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 |
| 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 |
| U.S. Highway 101 over Cortland Avenue | 1950 | 234,000 | Fair |
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.