20TH Ave over N Fork Buffalo Creek
Winnebago County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 20TH Ave over N Fork Buffalo Creek in Winnebago County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1989, making it 36 years old at the 2025 inventory.
- It carries about 409 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 20 of the 54 inventoried bridges in Winnebago County rated fair (37.0%); 16 (29.6%) 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 → (43.33455, -93.93171)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 78 ft |
| Location | 098260406 |
| NBI structure number | 000000000344651 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Winnebago County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 69 over Winnebago River | 1988 | 5,400 | Fair |
| Secor Ave over Winnebago River | 1966 | 3,200 | Fair |
| US 69 & Ia 9 over Winnebago River | 1988 | 2,960 | Fair |
| Ia 9 over Drainage Ditch | 1975 | 2,320 | Fair |
| US 69 over Lime Creek | 1931 | 1,970 | Fair |
| J St over Winnebago River | 1974 | 1,884 | Fair |
All bridges nearby: Winnebago County, IA bridge conditions · every bridge in Winnebago County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.