WB US 20 over Blackhawk Creek
GoodBlack Hawk County, Iowa · 0.7 Mi. W of Jct. US 63 · Structure no. 000000000605655
- Built
- 1984
- 41 years old
- Condition
- Good
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 421 ft
- 5 main spans
- Daily traffic
- 12,400
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
WB US 20 over Blackhawk Creek is a prestressed concrete stringer/multi-beam or girder carrying WB US 20 over Blackhawk Creek in Black Hawk County, Iowa. It was built in 1984, so it is 41 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 12,400 vehicles a day, roughly 14% of them trucks, projected to reach 12,400 by 2043. The structure is 421 ft (128.3 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was WB US 20 over Blackhawk Creek built?
It was built in 1984, making it 41 years old in 2025.
What condition is WB US 20 over Blackhawk 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 July 2023.
How much traffic does WB US 20 over Blackhawk Creek carry?
About 12,400 vehicles per day (2022 count), of which roughly 14% are trucks.
How long is WB US 20 over Blackhawk Creek?
The structure is 421 ft (128.3 m) long with a longest span of 96 ft (29.3 m) and a deck 43 ft wide.
Who owns WB US 20 over Blackhawk Creek?
It is owned by the State Highway Agency.