70TH St over Drainage Ditch
Howard County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 70TH St over Drainage Ditch in Howard County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2018, making it 7 years old at the 2025 inventory.
- It carries about 35 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 95 of the 212 inventoried bridges in Howard County rated good (44.8%); 41 (19.3%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (43.4144, -92.22271)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Steel slab |
| Length | about 25 ft |
| Location | 099121103 |
| NBI structure number | 000000000182971 |
| Condition class | Good |
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.