480TH over Small Stream
Mitchell County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 480TH over Small Stream in Mitchell County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1984, making it 41 years old at the 2025 inventory.
- It carries about 216 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 16 of the 167 inventoried bridges in Mitchell County rated poor (9.6%); 16 (9.6%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (43.4582, -92.94282)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 3 | Serious condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 37 ft |
| Location | 100182601 |
| NBI structure number | 000000000249201 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Mitchell County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 9 over Cedar River | 1992 | 2,990 | Good |
| Ia 9 over Sugar Creek | 2013 | 2,990 | Good |
| US 218 over Turtle Creek | 1987 | 2,530 | Good |
| US 218 over Stream | 1986 | 2,530 | Good |
| US 218 over Stream | 1967 | 2,530 | Good |
| US 218 over Otter Creek | 1970 | 2,530 | Fair |
All bridges nearby: Mitchell County, IA bridge conditions · every bridge in Mitchell County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.