US 71 over East Nishnabotna River
Audubon County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 71 over East Nishnabotna River in Audubon County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 2,470 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 96 of the 204 inventoried bridges in Audubon County rated fair (47.1%); 37 (18.1%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated June 2023, 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 → (41.65175, -94.8992)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 246 ft |
| Location | 1.1 Mi. S of Jct. Ia 44 |
| NBI structure number | 000000000014120 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Audubon County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 71 over Stream | 1983 | 3,700 | Good |
| US 71 over Bluegrass Creek | 2006 | 3,080 | Good |
| US 71 over Stream | 1923 | 2,380 | Fair |
| US 71 over Stream | 1961 | 2,380 | Fair |
| US 71 over Stream | 1961 | 2,380 | Fair |
| US 71 over Stream | 1923 | 2,380 | Fair |
All bridges nearby: Audubon County, IA bridge conditions · every bridge in Audubon County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.