SR C-20 over I-35
GoodFranklin County, Iowa · 2.0 Miles South of SR C13 · Structure no. 000000000602480
- Built
- 1973
- 52 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 279 ft
- 4 main spans
- Daily traffic
- 15
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
SR C-20 over I-35 is a prestressed concrete stringer/multi-beam or girder carrying SR C-20 over I-35 in Franklin County, Iowa. It was built in 1973, so it is 52 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 15 vehicles a day, projected to reach 15 by 2044. The structure is 279 ft (85 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 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 SR C-20 over I-35 built?
It was built in 1973, making it 52 years old in 2025.
What condition is SR C-20 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 November 2024.
How much traffic does SR C-20 over I-35 carry?
About 15 vehicles per day (2022 count).
How long is SR C-20 over I-35?
The structure is 279 ft (85 m) long with a longest span of 97 ft (29.6 m) and a deck 33 ft wide.
Who owns SR C-20 over I-35?
It is owned by the State Highway Agency.