161st Avenue over Boxelder Ck
FairPennington County, South Dakota · 0.6S New Underwood · Structure no. 000000052608295
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected August 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 81 ft
- 3 main spans
- Daily traffic
- 780
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
161st Avenue over Boxelder Ck is a prestressed concrete tee beam carrying 161st Avenue over Boxelder Ck in Pennington County, South Dakota. It was built in 1973, so it is 52 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 780 vehicles a day, roughly 12% of them trucks, projected to reach 780 by 2032. The structure is 81 ft (24.7 m) long and 31 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 161st Avenue over Boxelder Ck built?
It was built in 1973, making it 52 years old in 2025.
What condition is 161st Avenue over Boxelder Ck in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.
How much traffic does 161st Avenue over Boxelder Ck carry?
About 780 vehicles per day (2022 count), of which roughly 12% are trucks.
How long is 161st Avenue over Boxelder Ck?
The structure is 81 ft (24.7 m) long with a longest span of 39 ft (11.9 m) and a deck 31 ft wide.
Who owns 161st Avenue over Boxelder Ck?
It is owned by the County Highway Agency.