Backbone ST Pk over Maquoketa River
FairDelaware County, Iowa · In Backbone State Park · Structure no. 000000000699030
- Built
- 1934
- 91 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- 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 steel stringer/multi-beam or girder carrying Backbone ST Pk over Maquoketa River in Delaware County, Iowa. It was built in 1934, so it is 91 years old, older 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.
No traffic count is recorded. The structure is 103 ft (31.4 m) long and 22 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 1934, making it 91 years old in 2025.
What condition is Backbone ST Pk over Maquoketa River 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 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 34 ft (10.4 m) and a deck 22 ft wide.
Who owns Backbone ST Pk over Maquoketa River?
It is owned by the State Park, Forest, or Reservation Agency.