Backbone ST Pk over Maquoketa River
GoodDelaware County, Iowa · In Backbone State Park · Structure no. 000000000699041
- Built
- 1989
- 36 years old
- Condition
- Good
- inspected June 2024
- Type
- Slab
- Concrete Continuous
- Length
- 103 ft
- 3 main spans
- Daily traffic
- —
- 2022 count
- Owner
- State
- State Park, Forest, or Reservation Agency
About this bridge
Backbone ST Pk over Maquoketa River is a concrete continuous slab carrying Backbone ST Pk over Maquoketa River in Delaware County, Iowa. It was built in 1989, so it is 36 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.
No traffic count is recorded. The structure is 103 ft (31.4 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Backbone ST Pk over Maquoketa River built?
It was built in 1989, making it 36 years old in 2025.
What condition is Backbone ST Pk over Maquoketa River 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 June 2024.
How much traffic does Backbone ST Pk over Maquoketa River carry?
No traffic count is recorded for this structure.
How long is Backbone ST Pk over Maquoketa River?
The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.
Who owns Backbone ST Pk over Maquoketa River?
It is owned by the State Park, Forest, or Reservation Agency.