SB Ia 58 over US 20
GoodBlack Hawk County, Iowa · At Jct. U.S. 20 · Structure no. 000000000605630
- Built
- 1984
- 41 years old
- Condition
- Good
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 272 ft
- 4 main spans
- Daily traffic
- 155
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
SB Ia 58 over US 20 is a prestressed concrete stringer/multi-beam or girder carrying SB Ia 58 over US 20 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 155 vehicles a day, roughly 12% of them trucks, projected to reach 155 by 2044. The structure is 272 ft (82.9 m) long and 49 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SB Ia 58 over US 20 built?
It was built in 1984, making it 41 years old in 2025.
What condition is SB Ia 58 over US 20 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 February 2024.
How much traffic does SB Ia 58 over US 20 carry?
About 155 vehicles per day (2022 count), of which roughly 12% are trucks.
How long is SB Ia 58 over US 20?
The structure is 272 ft (82.9 m) long with a longest span of 97 ft (29.6 m) and a deck 49 ft wide.
Who owns SB Ia 58 over US 20?
It is owned by the State Highway Agency.