Sth 73 over Koshkonong Creek
FairDane County, Wisconsin · 3.2M N JCT Ush 12 to W · Structure no. B13093900000000
- Built
- 1934
- 91 years old, rebuilt 1967
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 33 ft
- 1 main span
- Daily traffic
- 4,200
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Sth 73 over Koshkonong Creek is a steel stringer/multi-beam or girder carrying Sth 73 over Koshkonong Creek in Dane County, Wisconsin. It was built in 1934 and reconstructed in 1967, so it is 91 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 4,200 vehicles a day, roughly 9% of them trucks, projected to reach 5,040 by 2042. The structure is 33 ft (10.1 m) long and 47 ft wide. If it were closed, the detour would be 34.8 mi (56 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sth 73 over Koshkonong Creek built?
It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1967.
What condition is Sth 73 over Koshkonong Creek 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 2023.
How much traffic does Sth 73 over Koshkonong Creek carry?
About 4,200 vehicles per day (2022 count), of which roughly 9% are trucks.
How long is Sth 73 over Koshkonong Creek?
The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.5 m) and a deck 47 ft wide.
Who owns Sth 73 over Koshkonong Creek?
It is owned by the State Highway Agency.