291st Ave over Antelope Ck
PoorPosted for loadStanley County, South Dakota · 10.3M S 2.25E Ft.Pir · Structure no. 000000059420398
- Built
- 1935
- 90 years old
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 104 ft
- 3 main spans
- Daily traffic
- 130
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
291st Ave over Antelope Ck is a steel stringer/multi-beam or girder carrying 291st Ave over Antelope Ck in Stanley County, South Dakota. It was built in 1935, so it is 90 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 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 130 vehicles a day, roughly 2% of them trucks, projected to reach 130 by 2032. The structure is 104 ft (31.7 m) long and 20 ft wide. If it were closed, the detour would be 14.3 mi (23 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 291st Ave over Antelope Ck built?
It was built in 1935, making it 90 years old in 2025.
What condition is 291st Ave over Antelope Ck 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 September 2024.
How much traffic does 291st Ave over Antelope Ck carry?
About 130 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 291st Ave over Antelope Ck?
The structure is 104 ft (31.7 m) long with a longest span of 34 ft (10.4 m) and a deck 20 ft wide.
Who owns 291st Ave over Antelope Ck?
It is owned by the County Highway Agency.