SD079 over Big Nasty Ck
FairHarding County, South Dakota · 13.7 N JCT Sd 20 · Structure no. 000000032518145
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 234 ft
- 3 main spans
- Daily traffic
- 364
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD079 over Big Nasty Ck is a steel continuous stringer/multi-beam or girder carrying SD079 over Big Nasty Ck in Harding County, South Dakota. It was built in 1962, so it is 63 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 5 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 364 vehicles a day, roughly 24% of them trucks, projected to reach 477 by 2044. The structure is 234 ft (71.3 m) long and 32 ft wide. If it were closed, the detour would be 24.2 mi (39 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 | 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SD079 over Big Nasty Ck built?
It was built in 1962, making it 63 years old in 2025.
What condition is SD079 over Big Nasty 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 July 2023.
How much traffic does SD079 over Big Nasty Ck carry?
About 364 vehicles per day (2024 count), of which roughly 24% are trucks.
How long is SD079 over Big Nasty Ck?
The structure is 234 ft (71.3 m) long with a longest span of 89 ft (27.2 m) and a deck 32 ft wide.
Who owns SD079 over Big Nasty Ck?
It is owned by the State Highway Agency.