100th St. over Union Creek
PoorPosted for loadClinton County, Iowa · 083E20101 · Structure no. 000000000124610
- Built
- 1900
- 125 years old, rebuilt 1960
- Condition
- Poor
- inspected June 2024
- Type
- Truss - Thru
- Steel
- Length
- 121 ft
- 1 main span
- Daily traffic
- 78
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
100th St. over Union Creek is a steel truss - thru carrying 100th St. over Union Creek in Clinton County, Iowa. It was built in 1900 and reconstructed in 1960, so it is 125 years old, older than the Iowa average of 45.5 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. Its operating status is: posted for load restriction.
It carries about 78 vehicles a day, projected to reach 78 by 2044. The structure is 121 ft (36.9 m) long and 21 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| 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 100th St. over Union Creek built?
It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1960.
What condition is 100th St. over Union 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 June 2024.
How much traffic does 100th St. over Union Creek carry?
About 78 vehicles per day (2022 count).
How long is 100th St. over Union Creek?
The structure is 121 ft (36.9 m) long with a longest span of 50 ft (15.2 m) and a deck 21 ft wide.
Who owns 100th St. over Union Creek?
It is owned by the County Highway Agency.