US 20 over Drainage Ditch
Buchanan County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 20 over Drainage Ditch in Buchanan County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1980, making it 45 years old at the 2025 inventory.
- It carries about 10,700 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 139 of the 320 inventoried bridges in Buchanan County rated good (43.4%); 20 (6.2%) 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 → (42.44903, -92.06416)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 0.4 mi. W of jct. SR V65 |
| NBI structure number | 000000000604895 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Buchanan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-380 over Mud Creek | 1983 | 17,700 | Good |
| 1ST St W over Wapsipinicon River | 1917 | 10,258 | Fair |
| US 20 over Drainage Ditch | 1980 | 10,100 | Good |
| US 20 over Drainage Ditch | 1980 | 10,100 | Fair |
| Ia 150 over Wapsipinicon River | 1927 | 9,000 | Fair |
| NB I-380 over Bear Creek | 1984 | 8,950 | Good |
All bridges nearby: Buchanan County, IA bridge conditions · every bridge in Buchanan County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.