FM 170TH St over Bohemian Creek
Howard County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- FM 170TH St over Bohemian Creek in Howard County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 80 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 41 of the 212 inventoried bridges in Howard County rated poor (19.3%); 41 (19.3%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2023, on a 24-month routine inspection cycle.
- 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 → (43.27012, -92.12929)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Concrete channel beam |
| Length | about 34 ft |
| Location | 098113401 |
| NBI structure number | 000000000182150 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | April 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 Howard County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 63 over Crane Creek | 1971 | 4,360 | Fair |
| US 63 over W.br.turkey River | 1993 | 3,930 | Good |
| US 63 over Upper Iowa River | 1982 | 3,860 | Fair |
| US 63 over Turkey River | 1971 | 3,830 | Fair |
| Ia 9 over So Branch Turkey River | 1974 | 3,440 | Fair |
| US 63 over Stream | 1993 | 3,360 | Good |
All bridges nearby: Howard County, IA bridge conditions · every bridge in Howard County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.