I-80 over Middle River
Adair County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-80 over Middle River in Adair County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1958, making it 67 years old at the 2025 inventory.
- It carries about 24,800 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 121 of the 303 inventoried bridges in Adair County rated fair (39.9%); 37 (12.2%) 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 → (41.49623, -94.58164)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 50 ft |
| Location | 3.3 Mi. E of SR N-54 |
| NBI structure number | 000000000013140 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Adair County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-80 over Drainage Ditch | 1959 | 27,600 | Fair |
| I-80 over Drainage Ditch | 1959 | 27,600 | Fair |
| I-80 over North River | 1958 | 25,900 | Fair |
| I-80 over Plunger Creek | 1959 | 25,900 | Fair |
| I-80 over Drainage Ditch | 1958 | 24,800 | Fair |
| Ia 25 over Iowa 25 | 1958 | 23,600 | Fair |
All bridges nearby: Adair County, IA bridge conditions · every bridge in Adair County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.