WB US 20 over I-35
FairHamilton County, Iowa · At JCT Interstate 35 · Structure no. 000000000026650
- Built
- 1968
- 57 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 261 ft
- 4 main spans
- Daily traffic
- 3,350
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
WB US 20 over I-35 is a prestressed concrete stringer/multi-beam or girder carrying WB US 20 over I-35 in Hamilton County, Iowa. It was built in 1968, so it is 57 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 3,350 vehicles a day, roughly 21% of them trucks, projected to reach 3,350 by 2044. The structure is 261 ft (79.6 m) long and 55 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 WB US 20 over I-35 built?
It was built in 1968, making it 57 years old in 2025.
What condition is WB US 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 September 2024.
How much traffic does WB US 20 over I-35 carry?
About 3,350 vehicles per day (2022 count), of which roughly 21% are trucks.
How long is WB US 20 over I-35?
The structure is 261 ft (79.6 m) long with a longest span of 80 ft (24.4 m) and a deck 55 ft wide.
Who owns WB US 20 over I-35?
It is owned by the State Highway Agency.