Coburg Road over Curtis Slough
Linn County, Oregon · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Coburg Road over Curtis Slough in Linn County, Oregon, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 1,854 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- 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 → (44.21258, -123.1256)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Concrete channel beam |
| Length | about 38 ft |
| Location | 0394 Mi S Harrisburg |
| NBI structure number | 12271 002A00394 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
All bridges nearby: Linn County, OR bridge conditions · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.