FM over Winnebago River
Winnebago County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM over Winnebago River in Winnebago County, Iowa, 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 1968, making it 57 years old at the 2025 inventory.
- It carries about 649 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.
- 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 March 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 → (43.34239, -93.63118)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 126 ft |
| Location | 098240103 |
| NBI structure number | 000000000344335 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 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 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.