Hwy 100 over Mosier Creek
Wasco County, Oregon · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Hwy 100 over Mosier Creek in Wasco County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1920, making it 105 years old at the 2025 inventory.
- It carries about 765 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 94 of the 148 inventoried bridges in Wasco County rated fair (63.5%); 16 (10.8%) 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 → (45.68466, -121.39442)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete deck arch |
| Length | about 182 ft |
| Location | In Mosier |
| NBI structure number | 00498 292 00064 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.
Busiest bridges in Wasco County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-84 (hwy 002) over Rock Creek | 1953 | 25,052 | Fair |
| I-84 (hwy 002) over UPRR | 2001 | 25,052 | Good |
| I-84 (hwy 002) over Mosier Creek | 2009 | 25,052 | Good |
| I-84 (hwy 002) over Rowena Conn | 1954 | 24,970 | Fair |
| I-84 (hwy 002) over Hwy 292 O-xing | 1964 | 24,749 | Fair |
| I-84 (hwy 002) over Union Street | 2003 | 24,749 | Good |
All bridges nearby: Wasco County, OR bridge conditions · every bridge in Wasco County · Oregon bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.