E23 170th ST over I-35
GoodStory County, Iowa · 2.1 Miles North of SR E29 · Structure no. 000000000049300
- Built
- 1967
- 58 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 274 ft
- 4 main spans
- Daily traffic
- 139
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
E23 170th ST over I-35 is a steel continuous stringer/multi-beam or girder carrying E23 170th ST over I-35 in Story County, Iowa. It was built in 1967, so it is 58 years old, older 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 139 vehicles a day, projected to reach 139 by 2043. The structure is 274 ft (83.5 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 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 E23 170th ST over I-35 built?
It was built in 1967, making it 58 years old in 2025.
What condition is E23 170th ST over I-35 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 October 2023.
How much traffic does E23 170th ST over I-35 carry?
About 139 vehicles per day (2022 count).
How long is E23 170th ST over I-35?
The structure is 274 ft (83.5 m) long with a longest span of 91 ft (27.7 m) and a deck 32 ft wide.
Who owns E23 170th ST over I-35?
It is owned by the State Highway Agency.