Sth 21 over Spring Brook
FairWinnebago County, Wisconsin · 3.0M E JCT Sth 116 to W · Structure no. B70010500000000
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected November 2024
- Type
- Slab
- Concrete Continuous
- Length
- 66 ft
- 2 main spans
- Daily traffic
- 10,300
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Sth 21 over Spring Brook is a concrete continuous slab carrying Sth 21 over Spring Brook in Winnebago County, Wisconsin. It was built in 1988, so it is 37 years old, younger 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 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 10,300 vehicles a day, roughly 5% of them trucks, projected to reach 13,900 by 2043. The structure is 66 ft (20.1 m) long and 47 ft wide. If it were closed, the detour would be 24.9 mi (40 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sth 21 over Spring Brook built?
It was built in 1988, making it 37 years old in 2025.
What condition is Sth 21 over Spring Brook 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 November 2024.
How much traffic does Sth 21 over Spring Brook carry?
About 10,300 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Sth 21 over Spring Brook?
The structure is 66 ft (20.1 m) long with a longest span of 31 ft (9.4 m) and a deck 47 ft wide.
Who owns Sth 21 over Spring Brook?
It is owned by the State Highway Agency.