WB 20 over US 218
FairBlack Hawk County, Iowa · At W Jct. I-380 · Structure no. 000000000605285
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 266 ft
- 4 main spans
- Daily traffic
- 10,200
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
WB 20 over US 218 is a steel continuous stringer/multi-beam or girder carrying WB 20 over US 218 in Black Hawk County, Iowa. It was built in 1983, so it is 42 years old, younger than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 10,200 vehicles a day, roughly 21% of them trucks, projected to reach 10,200 by 2043. The structure is 266 ft (81.1 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was WB 20 over US 218 built?
It was built in 1983, making it 42 years old in 2025.
What condition is WB 20 over US 218 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.
How much traffic does WB 20 over US 218 carry?
About 10,200 vehicles per day (2022 count), of which roughly 21% are trucks.
How long is WB 20 over US 218?
The structure is 266 ft (81.1 m) long with a longest span of 82 ft (25 m) and a deck 57 ft wide.
Who owns WB 20 over US 218?
It is owned by the State Highway Agency.