Cth Tt over Koshkonong Creek
PoorDane County, Wisconsin · 1.3M E JCT Cth N · Structure no. B13068000000000
- Built
- 1941
- 84 years old, rebuilt 1980
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 33 ft
- 1 main span
- Daily traffic
- 3,000
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
Cth Tt over Koshkonong Creek is a steel stringer/multi-beam or girder carrying Cth Tt over Koshkonong Creek in Dane County, Wisconsin. It was built in 1941 and reconstructed in 1980, so it is 84 years old, older than the Wisconsin average of 40.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 3,000 vehicles a day, projected to reach 3,600 by 2042. The structure is 33 ft (10.1 m) long and 43 ft wide. If it were closed, the detour would be 5 mi (8 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Cth Tt over Koshkonong Creek built?
It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1980.
What condition is Cth Tt over Koshkonong Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.
How much traffic does Cth Tt over Koshkonong Creek carry?
About 3,000 vehicles per day (2022 count).
How long is Cth Tt over Koshkonong Creek?
The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 43 ft wide.
Who owns Cth Tt over Koshkonong Creek?
It is owned by the County Highway Agency.