Interstate 580 WB over Hillside
Contra Costa County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Interstate 580 WB over Hillside in Contra Costa County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1985, making it 40 years old at the 2025 inventory.
- It carries about 34,000 vehicles a day (traffic count year 2009).
- Its listed owner is the state highway agency.
- It is one of 306 of the 622 inventoried bridges in Contra Costa County rated fair (49.2%); 56 (9.0%) are rated poor.
- 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 → (37.93233, -122.39369)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 259 ft |
| Location | 04-cc-580-r5.60-rch |
| NBI structure number | 28 0293R |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Contra Costa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 680 over Canal & Bike Path | 1956 | 257,000 | Fair |
| Interstate 680 over Monument Boulevard | 1998 | 235,000 | Poor |
| Interstate 680 over Parkside Drive | 1960 | 235,000 | Good |
| Interstate 680 over Rudgear Road | 1964 | 197,400 | Good |
| Interstate 680 over Livorna Road | 1964 | 197,400 | Good |
| Interstate 680 over Newell Avenue | 1994 | 195,300 | Fair |
All bridges nearby: Contra Costa County, CA bridge conditions · every bridge in Contra Costa County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.