Grande Ronde Road over Grande Ronde River
Union County, Oregon · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Grande Ronde Road over Grande Ronde River in Union County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1964, making it 61 years old at the 2025 inventory.
- It carries about 168 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 85 of the 169 inventoried bridges in Union County rated fair (50.3%); 8 (4.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 6 to 5, superstructure 6 to 5.
- Its most recent inspection on record is dated September 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (45.26192, -118.37911)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 6 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 110 ft |
| Location | Wallowa-whitman Natl Fors |
| NBI structure number | 61C43 000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Union County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-84 (hwy 006) over Ladd Creek(second Xing) | 2019 | 12,684 | Good |
| I-84 (hwy 006) over Ladd Creek Intch | 2019 | 12,684 | Good |
| I-84 (hwy 006) over Five Points Crk | 1960 | 12,564 | Fair |
| I-84 (hwy 006) over Hamilton Creek | 1960 | 12,538 | Fair |
| I-84 (hwy 006) over UPRR & Hwy 006 Bp | 1957 | 12,102 | Fair |
| I-84 (hwy 006) over Glover I/c (spring CR) | 1957 | 12,102 | Fair |
All bridges nearby: Union County, OR bridge conditions · every bridge in Union County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.