Banner Lava Cap Rd over State Route 20
Nevada County, California · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Banner Lava Cap Rd over State Route 20 in Nevada County, California, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1967, making it 58 years old at the 2025 inventory.
- It carries about 7,500 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 63 of the 137 inventoried bridges in Nevada County rated good (46.0%); 19 (13.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now good (deck 6 to 7, superstructure 5 to 7, substructure 5 to 8).
- Its most recent inspection on record is dated July 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (39.24317, -121.03151)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 7 | Good condition |
| Superstructure | 5 | 7 | Good condition |
| Substructure | 5 | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete multiple box beam |
| Length | about 308 ft |
| Location | 03-nev-020-r15.41 |
| NBI structure number | 17 0077 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Nevada County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 20 over Idaho-maryland Road | 1969 | 47,000 | Fair |
| State Route 20 over Wolf Creek | 1969 | 47,000 | Good |
| State Route 20 over SR 174 (colfax) Auburn | 1970 | 43,000 | Good |
| State Route 20 over Bank Street | 1969 | 34,500 | Good |
| State Route 20 over Bennett Street | 1969 | 34,500 | Fair |
| Interstate 80 over Donner Pass Road | 1991 | 34,000 | Fair |
All bridges nearby: Nevada County, CA bridge conditions · every bridge in Nevada County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.