N14 (310TH Ave) over Drainage Ditch
Dickinson County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N14 (310TH Ave) over Drainage Ditch in Dickinson County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1948, making it 77 years old at the 2025 inventory.
- It carries about 803 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- 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 → (43.42566, -94.97384)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 4 | Poor condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 20 ft |
| Location | 099350302 |
| NBI structure number | 000000000023760 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
All bridges nearby: Dickinson County, IA bridge conditions · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.