US 18 over Drainage Ditch
O'Brien County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 18 over Drainage Ditch in O'Brien 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 1958 and reconstructed in 1987, making it 67 years old at the 2025 inventory.
- It carries about 4,530 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 119 of the 263 inventoried bridges in O'Brien County rated fair (45.2%); 16 (6.1%) 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 → (43.18615, -95.74441)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 25 ft |
| Location | 0.1 mi. W of W Jct SR L40 |
| NBI structure number | 000000000038220 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in O'Brien County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 60 over Engels Creek | 2006 | 5,300 | Good |
| US 18 over Branch Little Floyd Rvr | 1958 | 4,530 | Fair |
| US 18 over Little Floyd River | 1957 | 4,230 | Fair |
| US 18 over Stream | 1959 | 3,640 | Fair |
| US 18 over Waterman Creek | 2020 | 3,530 | Good |
| US 18 over Stream | 1958 | 3,530 | Fair |
All bridges nearby: O'Brien County, IA bridge conditions · every bridge in O'Brien County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.