Local 120th ST over Little Sioux River
PoorPosted for loadHarrison County, Iowa · 081440703 · Structure no. 000000000179721
- Built
- 1971
- 54 years old, rebuilt 1986
- Condition
- Poor
- inspected December 2023
- Type
- Truss - Thru
- Steel
- Length
- 317 ft
- 1 main span
- Daily traffic
- 40
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
Local 120th ST over Little Sioux River is a steel truss - thru carrying Local 120th ST over Little Sioux River in Harrison County, Iowa. It was built in 1971 and reconstructed in 1986, so it is 54 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 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. Its operating status is: posted for load restriction.
It carries about 40 vehicles a day, projected to reach 40 by 2043. The structure is 317 ft (96.6 m) long and 24 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Local 120th ST over Little Sioux River built?
It was built in 1971, making it 54 years old in 2025. It was reconstructed in 1986.
What condition is Local 120th ST over Little Sioux River 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 December 2023.
How much traffic does Local 120th ST over Little Sioux River carry?
About 40 vehicles per day (2022 count).
How long is Local 120th ST over Little Sioux River?
The structure is 317 ft (96.6 m) long with a longest span of 150 ft (45.7 m) and a deck 24 ft wide.
Who owns Local 120th ST over Little Sioux River?
It is owned by the County Highway Agency.