L20 Loess Hills over Willow Creek
GoodHarrison County, Iowa · 079433016 · Structure no. 000000000027841
- Built
- 1993
- 32 years old
- Condition
- Good
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 406 ft
- 3 main spans
- Daily traffic
- 1,414
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
L20 Loess Hills over Willow Creek is a steel continuous stringer/multi-beam or girder carrying L20 Loess Hills over Willow Creek in Harrison County, Iowa. It was built in 1993, so it is 32 years old, younger 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 1,414 vehicles a day, roughly 16% of them trucks, projected to reach 1,414 by 2044. The structure is 406 ft (123.7 m) long and 39 ft wide. If it were closed, the detour would be 18 mi (29 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was L20 Loess Hills over Willow Creek built?
It was built in 1993, making it 32 years old in 2025.
What condition is L20 Loess Hills over Willow Creek 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 December 2024.
How much traffic does L20 Loess Hills over Willow Creek carry?
About 1,414 vehicles per day (2022 count), of which roughly 16% are trucks.
How long is L20 Loess Hills over Willow Creek?
The structure is 406 ft (123.7 m) long with a longest span of 156 ft (47.5 m) and a deck 39 ft wide.
Who owns L20 Loess Hills over Willow Creek?
It is owned by the County Highway Agency.