US 59 over Drainage Ditch
Shelby County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 59 over Drainage Ditch in Shelby County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1966, making it 59 years old at the 2025 inventory.
- It carries about 5,000 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 111 of the 207 inventoried bridges in Shelby County rated fair (53.6%); 18 (8.7%) 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 → (41.60649, -95.33496)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 2.8 mi. S of Jct. IA 44 |
| NBI structure number | 000000000047790 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Shelby County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 59 over Drainage Ditch | 1970 | 4,940 | Fair |
| US 59 over West Nishnabotna River | 1970 | 4,940 | Fair |
| US 59 over Jensen Creek | 1968 | 4,680 | Fair |
| Ia 44 over West Nishnabotna River | 1978 | 3,960 | Fair |
| US 59 over Lyon Creek | 1970 | 3,240 | Fair |
| US 59 over Drainage | 1970 | 3,080 | Good |
All bridges nearby: Shelby County, IA bridge conditions · every bridge in Shelby County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.