SR D-20 over I-35
FairHamilton County, Iowa · At Junction With D20 · Structure no. 000000000602555
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 292 ft
- 4 main spans
- Daily traffic
- 828
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
SR D-20 over I-35 is a steel continuous stringer/multi-beam or girder carrying SR D-20 over I-35 in Hamilton County, Iowa. It was built in 1972, so it is 53 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 828 vehicles a day, roughly 21% of them trucks, projected to reach 828 by 2042. The structure is 292 ft (89 m) long and 35 ft wide. 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR D-20 over I-35 built?
It was built in 1972, making it 53 years old in 2025.
What condition is SR D-20 over I-35 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 May 2024.
How much traffic does SR D-20 over I-35 carry?
About 828 vehicles per day (2022 count), of which roughly 21% are trucks.
How long is SR D-20 over I-35?
The structure is 292 ft (89 m) long with a longest span of 94 ft (28.7 m) and a deck 35 ft wide.
Who owns SR D-20 over I-35?
It is owned by the State Highway Agency.