Big Canyon Road over Big Canyon Creek
Lake County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Big Canyon Road over Big Canyon Creek in Lake County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 0 (failed condition, out of service) on the 0-9 scale.
- It was built in 1930 and reconstructed in 1993, making it 95 years old at the 2025 inventory.
- It carries about 304 vehicles a day (traffic count year 2008).
- Its listed owner is the county highway agency.
- It is one of 12 of the 131 inventoried bridges in Lake County rated poor (9.2%); 12 (9.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, temporary structure in place to carry legal loads while the original structure is closed awaiting replacement or rehabilitation (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: substructure 2 to 0.
- Its most recent inspection on record is dated March 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 0): scour critical: bridge has failed and is closed to traffic.
- 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 → (38.8462, -122.66418)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 2 | 0 | Failed condition, out of service |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 24 ft |
| Location | 8 1/4 Mi N of SR 175 |
| NBI structure number | 14C0115 |
| Condition class | Poor |
| Traffic status (item 41) | Open, temporary structure in place to carry legal loads while the original structure is closed awaiting replacement or rehabilitation |
| Last inspection (item 90) | March 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 0: scour critical: bridge has failed and is closed to traffic |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Lake County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| State Route 53 over Seigler Creek | 1952 | 16,500 | Fair |
| State Route 29 over Kelsey Creek | 1966 | 12,100 | Good |
| State Route 29 over Adobe Creek | 1966 | 12,100 | Good |
| State Route 29 over Hill Creek | 1966 | 12,100 | Good |
| State Route 29 over Manning Creek | 1966 | 12,100 | Good |
| State Route 29 over Putah Creek | 2003 | 10,900 | Good |
All bridges nearby: Lake County, CA bridge conditions · every bridge in Lake County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.