Lone Rock Road over Lone Rock Creek
Gilliam County, Oregon · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Lone Rock Road over Lone Rock Creek in Gilliam County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 2020, making it 5 years old at the 2025 inventory.
- It carries about 33 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 19 of the 35 inventoried bridges in Gilliam County rated fair (54.3%); 0 (0.0%) 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 → (45.08917, -119.88528)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 76 ft |
| Location | Lone Rock |
| NBI structure number | 23953 828 00000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Gilliam County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-84 (hwy 002) over Blalock Canyon Rd | 1964 | 14,269 | Fair |
| I-84 (hwy 002) over John Day River | 1963 | 14,253 | Fair |
| I-84 (hwy 002) over Arlington Viaduct | 1964 | 14,069 | Fair |
| I-84 (hwy 002) WB over Willow Creek West | 1954 | 7,076 | Fair |
| I-84 (hwy 002) EB over Willow Creek EB | 1965 | 7,076 | Fair |
| Or 19 (hwy 005) over China Creek | 1964 | 1,331 | Good |
All bridges nearby: Gilliam County, OR bridge conditions · every bridge in Gilliam County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.