Cth Bb over Koshkonong Creek
PoorDane County, Wisconsin · 1.9M E JCT Cth N · Structure no. P13003200000000
- Built
- 1914
- 111 years old
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 30 ft
- 1 main span
- Daily traffic
- 1,500
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
Cth Bb over Koshkonong Creek is a steel stringer/multi-beam or girder carrying Cth Bb over Koshkonong Creek in Dane County, Wisconsin. It was built in 1914, so it is 111 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 3 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 1,500 vehicles a day, projected to reach 1,800 by 2042. The structure is 30 ft (9 m) long and 42 ft wide. If it were closed, the detour would be 2.5 mi (4 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Cth Bb over Koshkonong Creek built?
It was built in 1914, making it 111 years old in 2025.
What condition is Cth Bb 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 Bb over Koshkonong Creek carry?
About 1,500 vehicles per day (2022 count).
How long is Cth Bb over Koshkonong Creek?
The structure is 30 ft (9 m) long with a longest span of 28 ft (8.5 m) and a deck 42 ft wide.
Who owns Cth Bb over Koshkonong Creek?
It is owned by the County Highway Agency.