Road M1 over Benmore Creek
Lake County, California · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Road M1 over Benmore Creek in Lake County, California, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1970, making it 55 years old at the 2025 inventory.
- It carries about 300 vehicles a day (traffic count year 1992).
- It is one of 79 of the 131 inventoried bridges in Lake County rated fair (60.3%); 12 (9.2%) 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 → (39.41114, -123.01345)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 5 | Fair condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Concrete multiple box beam |
| Length | about 113 ft |
| Location | 9 Mi. NE of Potter Valley |
| NBI structure number | 050854000001002 |
| Condition class | Fair |
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.