County Line Rd over Colusa Drain
Colusa County, California · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Line Rd over Colusa Drain in Colusa County, California, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1970, making it 55 years old at the 2025 inventory.
- It carries about 170 vehicles a day (traffic count year 2015).
- Its listed owner is the county highway agency.
- It is one of 12 of the 213 inventoried bridges in Colusa County rated poor (5.6%); 12 (5.6%) are rated poor.
- 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 → (38.9253, -121.91534)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 210 ft |
| Location | 4.5 Mi. East of I-5 |
| NBI structure number | 15C0027 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the California department of transportation.
Busiest bridges in Colusa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 5 over Hillgate Road | 1957 | 35,000 | Good |
| Interstate 5 over Brush Creek | 1967 | 35,000 | Good |
| Interstate 5 over Cortina Creek Overflow | 1946 | 33,000 | Good |
| Interstate 5 over Farm Land Drain | 1968 | 30,000 | Fair |
| Interstate 5 over South Branch Sand Creek | 1967 | 29,500 | Good |
| Interstate 5 over Petroleum Creek | 1967 | 18,000 | Fair |
All bridges nearby: Colusa County, CA bridge conditions · every bridge in Colusa County · California bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.