Lassen Road over Singer Creek Fork
Tehama County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Lassen Road over Singer Creek Fork in Tehama County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1981, making it 44 years old at the 2025 inventory.
- It carries about 80 vehicles a day (traffic count year 2010).
- Its listed owner is the county highway agency.
- It is one of 259 of the 447 inventoried bridges in Tehama County rated fair (57.9%); 21 (4.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: superstructure 5 to 6, substructure 5 to 6.
- Its most recent inspection on record is dated November 2024, 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 → (39.91401, -121.97052)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 6 | Satisfactory condition |
| Substructure | 5 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel girder and floorbeam |
| Length | about 38 ft |
| Location | 2.2 Mi E of SH 99 |
| NBI structure number | 08C0212 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Tehama County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 5 over Biggs Creek | 1940 | 36,500 | Good |
| Interstate 5 over Taylors Wash | 1946 | 36,000 | Fair |
| Interstate 5 over Thomes Creek | 2011 | 29,500 | Fair |
| Interstate 5 over Kopta Creek | 1965 | 29,000 | Fair |
| Interstate 5 over Las Flores Creek | 1965 | 28,000 | Good |
| Interstate 5 over Branch Coyote Creek | 1965 | 28,000 | Good |
All bridges nearby: Tehama County, CA bridge conditions · every bridge in Tehama County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.