IRR SD065 over Hump Ck
FairCorson County, South Dakota · 10.6 S JCT US 12 · Structure no. 000000016329127
- Built
- 1956
- 69 years old
- Condition
- Fair
- inspected January 2025
- Type
- Slab
- Concrete Continuous
- Length
- 175 ft
- 5 main spans
- Daily traffic
- 234
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR SD065 over Hump Ck is a concrete continuous slab carrying IRR SD065 over Hump Ck in Corson County, South Dakota. It was built in 1956, so it is 69 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 234 vehicles a day, roughly 24% of them trucks, projected to reach 306 by 2044. The structure is 175 ft (53.2 m) long and 34 ft wide. If it were closed, the detour would be 47.8 mi (77 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR SD065 over Hump Ck built?
It was built in 1956, making it 69 years old in 2025.
What condition is IRR SD065 over Hump 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 January 2025.
How much traffic does IRR SD065 over Hump Ck carry?
About 234 vehicles per day (2024 count), of which roughly 24% are trucks.
How long is IRR SD065 over Hump Ck?
The structure is 175 ft (53.2 m) long with a longest span of 35 ft (10.8 m) and a deck 34 ft wide.
Who owns IRR SD065 over Hump Ck?
It is owned by the State Highway Agency.