Sth 173 over Mill Creek
PoorMonroe County, Wisconsin · 1.5M N JCT Sth 21 · Structure no. B41002000000000
- Built
- 1956
- 69 years old, rebuilt 1990
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 33 ft
- 1 main span
- Daily traffic
- 1,800
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
Sth 173 over Mill Creek is a steel stringer/multi-beam or girder carrying Sth 173 over Mill Creek in Monroe County, Wisconsin. It was built in 1956 and reconstructed in 1990, so it is 69 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 1,800 vehicles a day, roughly 9% of them trucks, projected to reach 2,160 by 2041. The structure is 33 ft (10.1 m) long and 30 ft wide. If it were closed, the detour would be 12.4 mi (20 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, 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 Sth 173 over Mill Creek built?
It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1990.
What condition is Sth 173 over Mill 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 Sth 173 over Mill Creek carry?
About 1,800 vehicles per day (2021 count), of which roughly 9% are trucks.
How long is Sth 173 over Mill Creek?
The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 30 ft wide.
Who owns Sth 173 over Mill Creek?
It is owned by the State Highway Agency.