SD324 over I029
FairBrookings County, South Dakota · Sd 324 Interchange · Structure no. 000000006185210
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 254 ft
- 4 main spans
- Daily traffic
- 1,336
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SD324 over I029 is a steel continuous stringer/multi-beam or girder carrying SD324 over I029 in Brookings County, South Dakota. It was built in 1966, so it is 59 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 1,336 vehicles a day, roughly 15% of them trucks, projected to reach 2,009 by 2044. The structure is 254 ft (77.4 m) long and 32 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SD324 over I029 built?
It was built in 1966, making it 59 years old in 2025.
What condition is SD324 over I029 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 SD324 over I029 carry?
About 1,336 vehicles per day (2024 count), of which roughly 15% are trucks.
How long is SD324 over I029?
The structure is 254 ft (77.4 m) long with a longest span of 70 ft (21.3 m) and a deck 32 ft wide.
Who owns SD324 over I029?
It is owned by the State Highway Agency.