IH 43 SB over Sth 20
FairWalworth County, Wisconsin · 5.3 MI S JCT Sth 83 · Structure no. B64008900000000
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 210 ft
- 2 main spans
- Daily traffic
- 21,600
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
IH 43 SB over Sth 20 is a steel continuous stringer/multi-beam or girder carrying IH 43 SB over Sth 20 in Walworth County, Wisconsin. It was built in 1971, so it is 54 years old, older than the Wisconsin average of 40.3 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 21,600 vehicles a day, roughly 16% of them trucks, projected to reach 13,860 by 2042. The structure is 210 ft (64 m) long and 48 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IH 43 SB over Sth 20 built?
It was built in 1971, making it 54 years old in 2025.
What condition is IH 43 SB over Sth 20 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 October 2023.
How much traffic does IH 43 SB over Sth 20 carry?
About 21,600 vehicles per day (2022 count), of which roughly 16% are trucks.
How long is IH 43 SB over Sth 20?
The structure is 210 ft (64 m) long with a longest span of 105 ft (31.9 m) and a deck 48 ft wide.
Who owns IH 43 SB over Sth 20?
It is owned by the State Highway Agency.