I-35 over Walnut Creek
FairStory County, Iowa · 4.2 Miles N of JCT Ia 210 · Structure no. 000000000049170
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected September 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 51 ft
- 3 main spans
- Daily traffic
- 48,300
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-35 over Walnut Creek is a concrete continuous culvert carrying I-35 over Walnut Creek in Story County, Iowa. It was built in 1964, so it is 61 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.
It carries about 48,300 vehicles a day, roughly 18% of them trucks, projected to reach 48,300 by 2043. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 3.7 mi (6 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-35 over Walnut Creek built?
It was built in 1964, making it 61 years old in 2025.
What condition is I-35 over Walnut Creek 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 September 2023.
How much traffic does I-35 over Walnut Creek carry?
About 48,300 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is I-35 over Walnut Creek?
The structure is 51 ft (15.5 m) long with a longest span of 18 ft (5.5 m).
Who owns I-35 over Walnut Creek?
It is owned by the State Highway Agency.