SB I-35 over 324th Street
FairDecatur County, Iowa · At Missouri ST Line · Structure no. 000000000022820
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 198 ft
- 3 main spans
- Daily traffic
- 7,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SB I-35 over 324th Street is a steel continuous stringer/multi-beam or girder carrying SB I-35 over 324th Street in Decatur County, Iowa. It was built in 1970, so it is 55 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 5 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 7,000 vehicles a day, roughly 40% of them trucks, projected to reach 7,000 by 2043. The structure is 198 ft (60.4 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SB I-35 over 324th Street built?
It was built in 1970, making it 55 years old in 2025.
What condition is SB I-35 over 324th Street 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 August 2024.
How much traffic does SB I-35 over 324th Street carry?
About 7,000 vehicles per day (2023 count), of which roughly 40% are trucks.
How long is SB I-35 over 324th Street?
The structure is 198 ft (60.4 m) long with a longest span of 75 ft (22.9 m) and a deck 52 ft wide.
Who owns SB I-35 over 324th Street?
It is owned by the State Highway Agency.