Fern Flat Road over East Fork Dairy Creek
Washington County, Oregon · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Fern Flat Road over East Fork Dairy Creek in Washington County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1975, making it 50 years old at the 2025 inventory.
- It carries about 28 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 227 of the 334 inventoried bridges in Washington County rated fair (68.0%); 11 (3.3%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2024, on a 24-month routine inspection cycle.
- 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 → (45.7487, -123.0722)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 30 ft |
| Location | 013 Mi N Greener Road |
| NBI structure number | 671371065900130 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Washington County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-5 (hwy 001) over Lower Boonesferry | 1975 | 156,558 | Fair |
| I-5 (hwy 001) over Tualatin River | 1975 | 156,016 | Fair |
| I-5 (hwy 001) over P&w RR | 1975 | 154,838 | Fair |
| US 26 (hwy 047) EB over Cedar Hills Blvd | 1966 | 144,211 | Fair |
| US 26 (hwy 047) over Hwy 144 | 1986 | 133,089 | Fair |
| US 26 (Hwy 047) over Light Rail Transit | 1996 | 133,089 | Fair |
All bridges nearby: Washington County, OR bridge conditions · every bridge in Washington County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.