FM over Turkey Run
Mahaska County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM over Turkey Run in Mahaska County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1983, making it 42 years old at the 2025 inventory.
- It carries about 610 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 89 of the 221 inventoried bridges in Mahaska County rated fair (40.3%); 67 (30.3%) 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 → (41.20467, -92.81913)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 074172101 |
| NBI structure number | 000000000236041 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Mahaska County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 63 over Nenebec Creek | 1998 | 12,500 | Fair |
| Ia 163 over Muchakinok Creek | 1997 | 12,200 | Fair |
| Ia 163 over Little Muchikinock Creek | 1995 | 7,800 | Fair |
| US 63 over Little Muchakinock Creek | 1963 | 6,600 | Fair |
| Ia 92 over Spring Creek/pedestrian | 1958 | 6,400 | Fair |
| US 63 over Stream | 1982 | 6,350 | Good |
All bridges nearby: Mahaska County, IA bridge conditions · every bridge in Mahaska County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.