SD030 over Six Mile Ck
FairBrookings County, South Dakota · 3.4 E I 29 Interch · Structure no. 000000006219080
- Built
- 1956
- 69 years old
- Condition
- Fair
- inspected September 2023
- Type
- Slab
- Concrete Continuous
- Length
- 119 ft
- 4 main spans
- Daily traffic
- 1,199
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD030 over Six Mile Ck is a concrete continuous slab carrying SD030 over Six Mile Ck in Brookings 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 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 1,199 vehicles a day, roughly 21% of them trucks, projected to reach 1,803 by 2044. The structure is 119 ft (36.3 m) long and 34 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 | 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 SD030 over Six Mile Ck built?
It was built in 1956, making it 69 years old in 2025.
What condition is SD030 over Six Mile 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 September 2023.
How much traffic does SD030 over Six Mile Ck carry?
About 1,199 vehicles per day (2024 count), of which roughly 21% are trucks.
How long is SD030 over Six Mile Ck?
The structure is 119 ft (36.3 m) long with a longest span of 31 ft (9.4 m) and a deck 34 ft wide.
Who owns SD030 over Six Mile Ck?
It is owned by the State Highway Agency.