SB I-35 over Winnebago River
FairCerro Gordo County, Iowa · 2.3 Mi. S of Jct. Ia 9 · Structure no. 000000000019290
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 247 ft
- 3 main spans
- Daily traffic
- 10,500
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
SB I-35 over Winnebago River is a prestressed concrete stringer/multi-beam or girder carrying SB I-35 over Winnebago River in Cerro Gordo County, Iowa. It was built in 1971, so it is 54 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 10,500 vehicles a day, roughly 31% of them trucks, projected to reach 10,500 by 2044. The structure is 247 ft (75.3 m) long and 43 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 SB I-35 over Winnebago River built?
It was built in 1971, making it 54 years old in 2025.
What condition is SB I-35 over Winnebago 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 SB I-35 over Winnebago River carry?
About 10,500 vehicles per day (2022 count), of which roughly 31% are trucks.
How long is SB I-35 over Winnebago River?
The structure is 247 ft (75.3 m) long with a longest span of 82 ft (25 m) and a deck 43 ft wide.
Who owns SB I-35 over Winnebago River?
It is owned by the State Highway Agency.