Ramp D (nb) over Overflow
GoodBlack Hawk County, Iowa · 0.2 Mi. N Jct. Ia #57 · Structure no. 000000000601645
- Built
- 1995
- 30 years old
- Condition
- Good
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 493 ft
- 5 main spans
- Daily traffic
- 5,100
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ramp D (nb) over Overflow is a prestressed concrete stringer/multi-beam or girder carrying Ramp D (nb) over Overflow in Black Hawk County, Iowa. It was built in 1995, so it is 30 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 5,100 vehicles a day, roughly 21% of them trucks, projected to reach 5,100 by 2043. The structure is 493 ft (150.3 m) long and 29 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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ramp D (nb) over Overflow built?
It was built in 1995, making it 30 years old in 2025.
What condition is Ramp D (nb) over Overflow 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 August 2023.
How much traffic does Ramp D (nb) over Overflow carry?
About 5,100 vehicles per day (2022 count), of which roughly 21% are trucks.
How long is Ramp D (nb) over Overflow?
The structure is 493 ft (150.3 m) long with a longest span of 93 ft (28.3 m) and a deck 29 ft wide.
Who owns Ramp D (nb) over Overflow?
It is owned by the State Highway Agency.