180th Street over Big Sioux River
PoorPosted for loadHamlin County, South Dakota · 3N & 1.3W of Castlewood · Structure no. 000000029217020
- Built
- 1930
- 95 years old, rebuilt 1970
- Condition
- Poor
- inspected July 2024
- Type
- Truss - Thru
- Steel
- Length
- 62 ft
- 1 main span
- Daily traffic
- 135
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
180th Street over Big Sioux River is a steel truss - thru carrying 180th Street over Big Sioux River in Hamlin County, South Dakota. It was built in 1930 and reconstructed in 1970, so it is 95 years old, older than the South Dakota average of 48.9 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 135 vehicles a day, roughly 2% of them trucks, projected to reach 135 by 2032. The structure is 62 ft (18.9 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, 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 180th Street over Big Sioux River built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1970.
What condition is 180th Street over Big 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 July 2024.
How much traffic does 180th Street over Big Sioux River carry?
About 135 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 180th Street over Big Sioux River?
The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 16 ft wide.
Who owns 180th Street over Big Sioux River?
It is owned by the County Highway Agency.