US 20 over Drainage Ditch #4
GoodHamilton County, Iowa · 0.7 Mile E of JCT US 69 · Structure no. 000000000026590
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected June 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 25 ft
- 2 main spans
- Daily traffic
- 9,600
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 over Drainage Ditch #4 is a concrete continuous culvert carrying US 20 over Drainage Ditch #4 in Hamilton County, Iowa. It was built in 1968, so it is 57 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,600 vehicles a day, roughly 27% of them trucks, projected to reach 9,600 by 2042. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 20 over Drainage Ditch #4 built?
It was built in 1968, making it 57 years old in 2025.
What condition is US 20 over Drainage Ditch #4 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does US 20 over Drainage Ditch #4 carry?
About 9,600 vehicles per day (2022 count), of which roughly 27% are trucks.
How long is US 20 over Drainage Ditch #4?
The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).
Who owns US 20 over Drainage Ditch #4?
It is owned by the State Highway Agency.