Sth 21 over Wisconsin R Backwater
GoodAdams County, Wisconsin · 1.2M E of 18th Ave · Structure no. B01003200000000
- Built
- 2010
- 15 years old
- Condition
- Good
- inspected May 2021
- Type
- Slab
- Concrete
- Length
- 27 ft
- 1 main span
- Daily traffic
- 4,300
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
Sth 21 over Wisconsin R Backwater is a concrete slab carrying Sth 21 over Wisconsin R Backwater in Adams County, Wisconsin. It was built in 2010, so it is 15 years old, younger than the Wisconsin average of 40.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,300 vehicles a day, projected to reach 5,160 by 2041. The structure is 27 ft (8.1 m) long and 86 ft wide. If it were closed, the detour would be 31.7 mi (51 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| 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 Wisconsin R Backwater built?
It was built in 2010, making it 15 years old in 2025.
What condition is Sth 21 over Wisconsin R Backwater 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 May 2021.
How much traffic does Sth 21 over Wisconsin R Backwater carry?
About 4,300 vehicles per day (2021 count).
How long is Sth 21 over Wisconsin R Backwater?
The structure is 27 ft (8.1 m) long with a longest span of 24 ft (7.3 m) and a deck 86 ft wide.
Who owns Sth 21 over Wisconsin R Backwater?
It is owned by the State Highway Agency.