FM over Sm Stream
Louisa County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM over Sm Stream in Louisa County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1950, making it 75 years old at the 2025 inventory.
- It carries about 490 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 22 of the 151 inventoried bridges in Louisa County rated poor (14.6%); 22 (14.6%) 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 → (41.13718, -91.27977)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 3 | Serious condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 23 ft |
| Location | 073041104 |
| NBI structure number | 000000000223815 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Louisa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 61 over Millrace Creek | 1985 | 4,950 | Fair |
| US 61 over Overflow Iowa River | 1985 | 4,950 | Fair |
| US 61 over Overflow Iowa River | 1985 | 4,950 | Fair |
| US 61 over Overflow Iowa River | 1985 | 4,950 | Fair |
| US 61 over Muskrat Lake | 1985 | 4,950 | Fair |
| US 61 over Iowa River | 1980 | 4,950 | Fair |
All bridges nearby: Louisa County, IA bridge conditions · every bridge in Louisa County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.